| Event Id | 1187 |
| Source | Active Directory |
| Description | 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. |
| Event Information | The local domain controller received a compressed intersite replication message with an incompatible compression version number. This message was ignored. Verify that the domain controllers are running the same version of the operating system |
| Reference Links | Monitoring AD Changes: Article |
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