Process (PID=). DSAccess needs to close a connection to the Domain Controller due to error 0x.

Details
Product: Exchange
Event ID: 2115
Source: MSExchangeDSAccess
Version: 6.5.6940.0
Component: Microsoft Exchange Directory Access Cache
Message: Process <process name> (PID=<process id>). DSAccess needs to close a connection to the Domain Controller <distinguished name> due to error 0x<error code>.
   
Explanation

This event will be seen if Diagnostics Logging on the LDAP category of DSAccess is set to Medium for the server. DSAccess terminated the existing Lightweight Directory Access Protocol (LDAP) connection because of the specified error. The user operation will be retried, and the domain controller will still be used by DSAccess.

   
User Action

The error code should be of the format 0x800409ZZ, where ZZ is the hexadecimal value of a standard LDAP error. You can look up the LDAP error description in the “LDAP Error Codes” article on the Microsoft Knowledge Base site. Proceed based on what the error code mentions. Also check for Kerberos Time-Out problems.

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