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    My top immediate guess would be to try removing the ":3268" from the
    names of your AD servers in authLDAPServers1.<br>
    <br>
    Cheers,<br>
    Jules.<br>
    <br>
    <div class="moz-cite-prefix">On 01/11/2018 12:01, Igor David wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:WM!6e7661617da42a80a4e7d353ef9c357bd0044c09a3a83b2a90737c3a2eb51ff5deb46f35178f82859448c37465f4e6497b6a88f6cb1199f95991eff4b3b35239d60a6979779c3ebcde7e351c77aada6d!@mx.jul.es">
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                                        <div>Hi All,</div>
                                        <div><br>
                                        </div>
                                        <div>We are using ZendTo
                                          actively with AD
                                          authentication and it works
                                          well for a few years.</div>
                                        <div><br>
                                        </div>
                                        <div>However, we are installing
                                          new ZendTo system on AWS EC2
                                          instance (trying with Ubuntu
                                          18.4, Amazon Linux 2018.03 and
                                          RedHat7.5 distros) which we
                                          can't make to work with AD
                                          authentication.</div>
                                        <div><br>
                                        </div>
                                        <div>This is our existing
                                          preferences.php (OURDOMAIN,
                                          USERNAME and PASSWORD are
                                          replaced):</div>
                                        <div><br>
                                        </div>
                                        <div><b> 'authenticator'            
                                            => 'AD',<br>
                                             
                                            'authLDAPBaseDN1'          
                                            => 'DC=OURDOMAIN,DC=com',<br>
                                             
                                            'authLDAPServers1'         
                                            =>
                                            array('AD_SERVER1:3268','AD_SERVER2:3268'),<br>
                                             
                                            'authLDAPAccountSuffix1'   
                                            => '@OURDOMAIN.com',<br>
                                             
                                            'authLDAPUseSSL1'          
                                            => false,<br>
                                             
                                            'authLDAPBindUser1'        
                                            => 'USERNAME',<br>
                                             
                                            'authLDAPBindPass1'        
                                            => 'PASSWORD',<br>
                                             
                                            'authLDAPOrganization1'    
                                            => 'OUR ORGANIZATION',<br>
                                             
                                            'authLDAPBaseDN2'          
                                            =>
                                            'DC=soton,DC=ac,DC=uk',<br>
                                             
                                            'authLDAPServers2'         
                                            => array(),<br>
                                             
                                            'authLDAPAccountSuffix2'   
                                            => '@<a
                                              href="http://soton.ac.uk"
                                              moz-do-not-send="true">soton.ac.uk</a>',<br>
                                             
                                            'authLDAPUseSSL2'          
                                            => false,<br>
                                             
                                            'authLDAPBindUser2'        
                                            => 'SecretUsername2',<br>
                                             
                                            'authLDAPBindPass2'        
                                            => 'SecretPassword2',<br>
                                             
                                            'authLDAPOrganization2'    
                                            => 'University of
                                            Southampton',</b></div>
                                        <div><br>
                                        </div>
                                        <div><br>
                                        </div>
                                        <div>in that case, we can't
                                          connect and are getting an
                                          error on ZendTo front-end
                                          page:<br>
                                        </div>
                                        <div><br>
                                        </div>
                                        <div><i>LDAP Error<br>
                                                Check User: Unable to
                                            connect to any of the
                                            authentication servers;
                                            could not authenticate user.
                                            Please notify the system
                                            administrator.<br>
                                                Authentication Error<br>
                                                The username or password
                                            was incorrect.</i></div>
                                        <div><br>
                                        </div>
                                        <div>Apache error:</div>
                                        <div><br>
                                        </div>
                                        <div><i>[Thu Nov 01
                                            11:28:32.666278 2018]
                                            [php7:warn] [pid 1397]
                                            [client <a
                                              href="http://10.254.48.252:58828"
                                              moz-do-not-send="true">10.254.48.252:58828</a>]
                                            PHP Warning: 
                                            ldap_connect(): Could not
                                            create session handle: Bad
                                            parameter to an ldap routine
                                            in
                                            /opt/zendto/lib/NSSADAuthenticator.php
                                            on line 527</i></div>
                                        <div><br>
                                        </div>
                                        <div>Zendto log:</div>
                                        <div><br>
                                        </div>
                                        <div><i>2018-11-01 11:28:32
                                            10.254.48.252 [ZendTo]:
                                            Warning: authorization
                                            failed for USERNAME</i></div>
                                        <div><br>
                                        </div>
                                        <div><br>
                                        </div>
                                        <div>We have also tried to
                                          remove ports in server names
                                          like this<br>
                                        </div>
                                        <div><br>
                                        </div>
                                        <div>
                                          <div> <b>'authenticator'            
                                              => 'AD',<br>
                                               
                                              'authLDAPBaseDN1'          
                                              =>
                                              'DC=OURDOMAIN,DC=com',<br>
                                               
                                              'authLDAPServers1'         
                                              =>
                                              array('AD_SERVER1','AD_SERVER2'),<br>
                                               
                                              'authLDAPAccountSuffix1'   
                                              => '@OURDOMAIN.com',<br>
                                               
                                              'authLDAPUseSSL1'          
                                              => false,<br>
                                               
                                              'authLDAPBindUser1'        
                                              => 'USERNAME',<br>
                                               
                                              'authLDAPBindPass1'        
                                              => 'PASSWORD',<br>
                                               
                                              'authLDAPOrganization1'    
                                              => 'OUR ORGANIZATION',<br>
                                               
                                              'authLDAPBaseDN2'          
                                              =>
                                              'DC=soton,DC=ac,DC=uk',<br>
                                               
                                              'authLDAPServers2'         
                                              => array(),<br>
                                               
                                              'authLDAPAccountSuffix2'   
                                              => '@<a
                                                href="http://soton.ac.uk"
                                                moz-do-not-send="true">soton.ac.uk</a>',<br>
                                               
                                              'authLDAPUseSSL2'          
                                              => false,<br>
                                               
                                              'authLDAPBindUser2'        
                                              => 'SecretUsername2',<br>
                                               
                                              'authLDAPBindPass2'        
                                              => 'SecretPassword2',<br>
                                               
                                              'authLDAPOrganization2'    
                                              => 'University of
                                              Southampton',</b></div>
                                          <div><br>
                                          </div>
                                        </div>
                                        <div><br>
                                        </div>
                                        <div>then we got just the
                                          following error on ZendTo
                                          webpage:</div>
                                        <div><br>
                                        </div>
                                        <div>
                                          <table class="gmail-UD_error"
                                            width="50%">
                                            <tbody>
                                              <tr>
                                                <td
                                                  class="gmail-UD_error_title"><br>
                                                </td>
                                                <td
                                                  class="gmail-UD_error_title"><i>Authentication
                                                    Error</i></td>
                                              </tr>
                                              <tr>
                                                <td
                                                  class="gmail-UD_error_message"><br>
                                                </td>
                                                <td
                                                  class="gmail-UD_error_message"><i>The
                                                    username or password
                                                    was incorrect.</i></td>
                                              </tr>
                                            </tbody>
                                          </table>
                                        </div>
                                        <div><br>
                                        </div>
                                        <div>and no errors in Apache,
                                          Zendto log:</div>
                                        <div><br>
                                        </div>
                                        <div><i>2018-11-01 11:32:56
                                            10.254.48.252 [ZendTo]:
                                            Warning: authorization
                                            failed for USERNAME</i></div>
                                        <div><br>
                                        </div>
                                        <div><br>
                                        </div>
                                        <div><br>
                                        </div>
                                        <div><br>
                                        </div>
                                        <div>We have tried it also like
                                          this:</div>
                                        <div><br>
                                          <b>'authenticator'            
                                            => 'AD',<br>
                                            'authLDAPBaseDN1'          
                                            => 'DC=OURDOMAIN,DC=com',<br>
                                            'authLDAPServers1'         
                                            =>
                                            array('AD_SERVER1:3268','AD_SERVER2:3268'),<br>
                                            'authLDAPAccountSuffix1'   
                                            => '@OURDOMAIN.com',<br>
                                            'authLDAPUseSSL1'          
                                            => false,<br>
                                            'authLDAPBindUser1'        
                                            => 'USERNAME',<br>
                                            'authLDAPBindPass1'        
                                            => 'PASSWORD',<br>
                                            'authLDAPBaseOrganization1'
                                            => 'OUR ORGANIZATION',<br>
                                            'authLDAPBaseDN2'          
                                            => '',<br>
                                            //    Leave blank if not
                                            using a 2nd forest.<br>
                                            'authLDAPServers2'         
                                            => '',<br>
                                            //    Leave blank if not
                                            using a 2nd forest.<br>
                                            'authLDAPAccountSuffix2'   
                                            => '',<br>
                                            //    Leave blank if not
                                            using a 2nd forest.<br>
                                            'authLDAPUseSSL2'          
                                            => '',<br>
                                            //    Leave blank if not
                                            using a 2nd forest.<br>
                                            'authLDAPBindUser2'        
                                            => '',<br>
                                            //    Leave blank if not
                                            using a 2nd forest.<br>
                                            'authLDAPBindPass2'        
                                            => '',<br>
                                            //    Leave blank if not
                                            using a 2nd forest.<br>
                                            'authLDAPBaseOrganization2' 
                                            => '',<br>
                                            //    Leave blank if not
                                            using a 2nd forest. </b></div>
                                        <div><br>
                                        </div>
                                        <div>It throws message on Zendto
                                          front-end page but keep users
                                          marked as logged in:</div>
                                        <div><br>
                                        </div>
                                        <div>
                                          <table class="gmail-UD_error"
                                            width="50%">
                                            <tbody>
                                              <tr>
                                                <td
                                                  class="gmail-UD_error_title">LDAP
                                                  Error</td>
                                              </tr>
                                              <tr>
                                                <td
                                                  class="gmail-UD_error_message"><br>
                                                </td>
                                                <td
                                                  class="gmail-UD_error_message"><i>Check
                                                    User: Unable to
                                                    connect to any of
                                                    the authentication
                                                    servers; could not
                                                    authenticate user.
                                                    Please notify the
                                                    system
                                                    administrator.</i></td>
                                              </tr>
                                            </tbody>
                                          </table>
                                        </div>
                                        <div><br>
                                        </div>
                                        <div><br>
                                        </div>
                                        <div>Apache error:</div>
                                        <div><i><br>
                                          </i></div>
                                        <div><i>[Thu Nov 01
                                            11:12:11.381516 2018]
                                            [php7:warn] [pid 903]
                                            [client <a
                                              href="http://10.254.48.252:58118"
                                              moz-do-not-send="true">10.254.48.252:58118</a>]
                                            PHP Warning: 
                                            ldap_connect(): Could not
                                            create session handle: Bad
                                            parameter to an ldap routine
                                            in
                                            /opt/zendto/lib/NSSADAuthenticator.php
                                            on line 527</i></div>
                                        <div><br>
                                        </div>
                                        <div>ZendTo log:</div>
                                        <div><br>
                                        </div>
                                        <div><i>2018-11-01 11:13:56
                                            10.254.48.252 [ZendTo]:
                                            Info: authorization
                                            succeeded for USERNAME<br>
                                            2018-11-01 11:13:56
                                            10.254.48.252 [ZendTo]:
                                            Info: user authentication
                                            verified user as 'USERNAME'</i><br>
                                          <br>
                                        </div>
                                        <div><br>
                                        </div>
                                        <div>Also when we change AD
                                          servers like this (servers
                                          without :3268 at the end):</div>
                                        <div><br>
                                        </div>
                                        <div><b>'authenticator'            
                                            => 'AD',<br>
                                            'authLDAPBaseDN1'          
                                            => 'DC=OURDOMAIN,DC=com',<br>
                                            'authLDAPServers1'         
                                            =>
                                            array('AD_SERVER1','AD_SERVER2'),<br>
                                            'authLDAPAccountSuffix1'   
                                            => '@OURDOMAIN.com',<br>
                                            'authLDAPUseSSL1'          
                                            => false,<br>
                                            'authLDAPBindUser1'        
                                            => 'USERNAME',<br>
                                            'authLDAPBindPass1'        
                                            => 'PASSWORD',<br>
                                            'authLDAPBaseOrganization1'
                                            => 'OUR ORGANIZATION',<br>
                                            'authLDAPBaseDN2'          
                                            => '',<br>
                                            //    Leave blank if not
                                            using a 2nd forest.<br>
                                            'authLDAPServers2'         
                                            => '',<br>
                                            //    Leave blank if not
                                            using a 2nd forest.<br>
                                            'authLDAPAccountSuffix2'   
                                            => '',<br>
                                            //    Leave blank if not
                                            using a 2nd forest.<br>
                                            'authLDAPUseSSL2'          
                                            => '',<br>
                                            //    Leave blank if not
                                            using a 2nd forest.<br>
                                            'authLDAPBindUser2'        
                                            => '',<br>
                                            //    Leave blank if not
                                            using a 2nd forest.<br>
                                            'authLDAPBindPass2'        
                                            => '',<br>
                                            //    Leave blank if not
                                            using a 2nd forest.<br>
                                            'authLDAPBaseOrganization2' 
                                            => '',<br>
                                            //    Leave blank if not
                                            using a 2nd forest. </b></div>
                                        <div><br>
                                        </div>
                                        <div><br>
                                        </div>
                                        <div><br>
                                        </div>
                                        <div>then ANYONE can login and
                                          there is no ZendTo front end
                                          or Apache error.<br>
                                        </div>
                                        <div><br>
                                        </div>
                                        <div>This is zendto.log in that
                                          case:<br>
                                        </div>
                                        <div><br>
                                        </div>
                                        <i>2018-11-01 11:18:17
                                          10.254.48.252 [ZendTo]: Info:
                                          authorization succeeded for
                                          USERNAME<br>
                                          2018-11-01 11:18:17
                                          10.254.48.252 [ZendTo]: Info:
                                          user authentication verified
                                          user as USERNAME</i><br>
                                      </div>
                                      <div dir="ltr"><br>
                                      </div>
                                      <div dir="ltr"><br>
                                      </div>
                                      <div>When we try like this:</div>
                                      <div><br>
                                      </div>
                                      <div><b>'authenticator' =>
                                          'AD',<br>
                                          'authLDAPBaseDN1' =>
                                          array('DC=OURDOMAIN,DC=com'),<br>
                                          'authLDAPServers1' =>
                                          array('AD_SERVER:3268'),<br>
                                          'authLDAPAccountSuffix1' =>
                                          '@OURDOMAIN.com',<br>
                                          'authLDAPUseSSL1' => false,
                                          <br>
                                          'authLDAPBindUser1' =>
                                          'USERNAME',<br>
                                          'authLDAPBindPass1' =>
                                          'PASSWORD',<br>
                                          'authLDAPOrganization1' =>
                                          'OUR ORGANIZATION',</b></div>
                                      <div><br>
                                      </div>
                                      <div>Then ANYONE can login but
                                        with the error on front-end
                                        Zendto page:</div>
                                      <div><br>
                                      </div>
                                      <div>
                                        <table class="gmail-UD_error"
                                          width="50%">
                                          <tbody>
                                            <tr>
                                              <td
                                                class="gmail-UD_error_title"><br>
                                              </td>
                                              <td
                                                class="gmail-UD_error_title"><i>LDAP
                                                  Error</i></td>
                                            </tr>
                                            <tr>
                                              <td
                                                class="gmail-UD_error_message"><br>
                                              </td>
                                              <td
                                                class="gmail-UD_error_message"><i>Check
                                                  User: Unable to
                                                  connect to any of the
                                                  authentication
                                                  servers; could not
                                                  authenticate user.
                                                  Please notify the
                                                  system administrator.</i></td>
                                            </tr>
                                          </tbody>
                                        </table>
                                      </div>
                                      <div><br>
                                      </div>
                                      <div> Apache error:</div>
                                      <div><br>
                                      </div>
                                      <div dir="ltr"><i>[Thu Nov 01
                                          11:49:21.846106 2018]
                                          [php7:warn] [pid 1397] [client
                                          <a
                                            href="http://10.254.48.252:59694"
                                            moz-do-not-send="true">10.254.48.252:59694</a>]
                                          PHP Warning:  ldap_connect():
                                          Could not create session
                                          handle: Bad parameter to an
                                          ldap routine in
                                          /opt/zendto/lib/NSSADAuthenticator.php
                                          on line 527</i></div>
                                      <div dir="ltr"><br>
                                      </div>
                                      <div>zendto.log:<br>
                                      </div>
                                      <div><br>
                                      </div>
                                      <div><i>2018-11-01 11:49:21
                                          10.254.48.252 [ZendTo]: Info:
                                          authorization succeeded for
                                          USERNAME<br>
                                          2018-11-01 11:49:21
                                          10.254.48.252 [ZendTo]: Info:
                                          user authentication verified
                                          user as 'USERNAME'</i></div>
                                      <div><br>
                                      </div>
                                      <div><br>
                                      </div>
                                      <div>IF we try like this (without
                                        :3268 for server):</div>
                                      <div><br>
                                      </div>
                                      <div>
                                        <b>'authenticator' => 'AD',<br>
                                          'authLDAPBaseDN1' =>
                                          array('DC=OURDOMAIN,DC=com'),<br>
                                          'authLDAPServers1' =>
                                          array('AD_SERVER:'),<br>
                                          'authLDAPAccountSuffix1' =>
                                          '@OURDOMAIN.com',<br>
                                          'authLDAPUseSSL1' => false,
                                          <br>
                                          'authLDAPBindUser1' =>
                                          'USERNAME',<br>
                                          'authLDAPBindPass1' =>
                                          'PASSWORD',<br>
                                          'authLDAPOrganization1' =>
                                          'OUR ORGANIZATION', </b><br>
                                      </div>
                                      <div><br>
                                      </div>
                                      <div>then ANYONE can login and no
                                        error on Frontend Zendto page,
                                        no Apache error, zendto log:</div>
                                      <div><br>
                                      </div>
                                      <div><i>2018-11-01 11:55:17
                                          10.254.48.252 [ZendTo]: Info:
                                          user authentication verified
                                          user as 'USERNAME'</i><br>
                                      </div>
                                      <div><br>
                                      </div>
                                      <div><br>
                                      </div>
                                      <div>We have checked <a
                                          href="https://zend.to/activedirectory.php"
                                          moz-do-not-send="true">https://zend.to/activedirectory.php</a>
                                        and I can query LDAP with the
                                        command:</div>
                                      <div><br>
                                      </div>
                                      <div><i>ldapsearch -x -LLL -E
                                          pr=200/noprompt -h
                                          AD_SERVER1:3268 -D 'USERNAME'
                                          -w 'PASSWORD' -b
                                          'DC=OURDOMAIN,DC=com' -s sub
                                          '(sAMAccountName=*)' cn mail
                                          memberOf</i></div>
                                      <div><br>
                                      </div>
                                      <div><br>
                                      </div>
                                      <div>Our software versions:</div>
                                      <div><br>
                                      </div>
                                      <div>PHP: 7.2.10</div>
                                      <div>Apache: 2.4.6</div>
                                      <div>Zendto: <span
                                          style="white-space:nowrap">Version
                                          5.15-1</span> <br>
                                      </div>
                                      <div><br>
                                      </div>
                                      <div>Did anyone had the same issue
                                        maybe, is there any solution,
                                        does anyone have configuration
                                        example for AD authentication?</div>
                                      <div><br>
                                      </div>
                                      <div>Thanks in advance!</div>
                                    </div>
                                  </div>
                                </div>
                              </div>
                            </div>
                          </div>
                        </div>
                      </div>
                    </div>
                  </div>
                </div>
              </div>
            </div>
          </div>
        </div>
      </div>
    </blockquote>
    <br>
    <pre class="moz-signature" cols="72">Jules

-- 
Julian Field MEng CEng CITP MBCS MIEEE MACM

'In Flanders fields the poppies blow
 Between the crosses, row on row,
 That mark our place: and in the sky
 The larks still bravely singing fly
 Scarce heard amid the guns below.

 We are the dead: Short days ago,
 We lived, felt dawn, saw sunset glow,
 Loved and were loved: and now we lie
 In Flanders fields!

 Take up our quarrel with the foe
 To you, from failing hands, we throw
 The torch: be yours to hold it high
 If ye break faith with us who die,
 We shall not sleep, though poppies grow
 In Flanders fields.' Lieutenant Colonel John McCrae

Composed at the battlefront on May 3, 1915 
during the second battle of Ypres, Belgium

<a class="moz-txt-link-abbreviated" href="http://www.Zend.To">www.Zend.To</a>
Twitter: @JulesFM
</pre>
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