The directory replication agent (DRA) received and discarded a compressed intersite replication message because it has an incompatible compression version number. You might have different versions of the directory. Make sure that all directories are running the same version of the Windows Server software.

Details
Product: Windows Operating System
Event ID: 1187
Source: Active Directory
Version: 5.0
Symbolic Name: DIRLOG_DRA_INCOMPAT_MAIL_MSG_C
Message: The directory replication agent (DRA) received and discarded a compressed intersite replication message because it has an incompatible compression version number. You might have different versions of the directory. Make sure that all directories are running the same version of the Windows Server software.
   
Explanation

The local domain controller received a compressed intersite replication message with an incompatible compression version number. This message was ignored.

   
User Action

Verify that the domain controllers are running the same version of the operating system.

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