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Event ID: 2111 Source: MSExchangeDSAccess

Process <process> (PID=<PID>). Received LDAP_SERVER_DOWN (0x51) from Directory Server server_name due to Kerberos ticket timeout.
From a newsgroup post: "We actually deleted a user who was part of Domain Admin Group and had SeInteractiveLogon right on the Domain Controller GPO. When this user was deleted, the permissions on Default GPO and Default DC GPO still existed. This user account in one or more Group policy objects (GPOs) could not be resolved to a SID. We were able to trace this user from %SYSTEMROOT%\Security\Logs\win­logon.log and remove him from the GPOs too. We Rebooted the server and we could see Event ID 2080 which meant that things are normal".
As per Microsoft: "This event will be seen if Diagnostics Logging on the LDAP category of DSAccess is set to Minimum for the server. This event indicates that DSAccess terminated the existing Lightweight Directory Access Protocol (LDAP) connection because the Kerberos ticket expired. The user operation will be retried, and the domain controller will still be used by DSAccess". See MSEX2K3DB for more details.
As per ME329272: "This problem may occur if Kerberos tickets expire on the Exchange 2000 server. These error messages are informational. The default time to live (TTL) for a Kerberos ticket is 10 hours".

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