When trying to re-enumerate the Exchange Organization the following error is received: "Unknown e (4311545)

When trying to re-enumerate the Exchange Organization the following error is received via a pop-up box: 

"Unknown error occurred (LDAP_OTHER). Cannot establish a session with an LDAP server (HostName 'servername', ldap_open)."

"Cannot refresh the directory information for 'servername'.  See the EMW.log file for details.  After you fix the errors, refresh the directory information again."

Please note the above log name is incorrect.  The correct log is called EMWMigration.log.  The log entries associated with the above errors are as follows:

8/29/2008 9:39:21 AM Unknown error occurred (LDAP_OTHER). Cannot establish a session with an LDAP server (HostName 'servername', ldap_open).
8/29/2008 9:39:22 AM aeEMWGUIShared::LDAPSearcher::Log Error: (Computer:  | Error: 80 | Description: Unknown error occurred (LDAP_OTHER). Cannot establish a session with an LDAP server (HostName 'servername', ldap_open). | Severity: 0 | Source: )
8/29/2008 9:39:22 AM aeEMWGUIShared::LDAPSearcher::Retrieve Error: (Cannot open LDAP on servername)
8/29/2008 9:39:22 AM aeEMWGUIShared::E2kEnumerator::RetrieveRootDSEInfo Error: (Error during search in the Active Directory)
8/29/2008 9:39:22 AM aeEMWGUIShared::E2kEnumerator::Enumerate Error: (Cannot retrieve information from RootDSE)
8/29/2008 9:39:22 AM Cannot refresh the directory information for servername. See the EMW.log file for details. After you fix the errors, refresh the directory information again.
8/29/2008 9:39:23 AM aeEMWGUIShared::E2kEnumerator::Enumerate %%%%%%%%%%%%%%%%%%%% Enumerate organization (end) %%%%%%%%%%%%%%%%%%%%
8/29/2008 9:39:23 AM aeEMWGUIShared::E2kEnumerator::Refresh Error: (Cannot enumerate organization)

These errors are caused by an incorrect domain controller (DC) specified in the Associated Domain Controller property of Exchange Server used for enumeration in either the source or target organization.  This can happen when a DC fails, is taken off line or some other issue that no longer makes it a viable domain controller.

Please see the following instruction on how to set the Associated Domain Controller:

1. In the QMM console, select the Organization you wish to correct and expand the organization until you get to the Exchange server mentioned in the errors.
2. Right click on the server and select Properties.
3. Under General, select Associated domain controller.
4. In the Active Directory server field select the drop down box which contains a list of domain controllers.
5. After the DC has been selected, select OK.

You should now be able to re-enumerate the Organization by selecting the organization, right clicking on it and add the organization again.

Note: Don't forget to stop and start any agents in the Source or Target, which ever organization was updated, so that the new updated config.ini will be user.  This config.ini was created when you pressed the OK button and is not used by the agents until they are restarted.

Also see solution SOL31540 - Error refreshing Exchange server in QMM project manager. - https://support.quest.com/SUPPORT/index?page=solution&id=SOL31540 with a similar error but caused by a different reason.

A change request, CR#55458 has been created with Development to address the incorrect log name noted in the Problem Description.