Failed to execute a stored procedure on the back-end. This has caused User Replicator to abort user synchronization. Users ...

Failed to execute a stored procedure on the back-end. This has caused User Replicator to abort user synchronization. Users will not be synchronized until this problem is resolved.

Stored Procedure: %1 Error: %2.
Cause: Typically occurs when the back-end is down or not reachable, or the server is out of memory.
Resolution:
Verify the back-end is up and this Enterprise Edition Server has connectivity to it; also verify that the Enterprise Edition Server is not low on memory.