Internal error: The directory replication agent (DRA) got an exception in X400 stubs during intersite replication. Stop and restart this Microsoft Exchange Server computer.
As per Microsoft: "This problem is caused by lack of disk space on the drive where the Mtadata subdirectory is located. It can also be caused by a temp or tmp variable that points to a non-existent or full disk". See ME181433 for more details.
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