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Event ID: 1232 Source: NTDSReplication

The remote procedure call (RPC) which was being executed by thread id <thread number> has been canceled.
After reading contributorís Shawn Anderson comment on EventID 1188 from source NTDS Replication and determining that the problem is related with Microsoft's hotfix KB893066, I have uninstalled the hotfix from all DCs and rebooted. The problem did not reappear.
In my case, this appeared on one domain controller connected to the rest of the network via a VPN. The Internet connection supporting this VPN had experienced some packet loss. So this event may indicate a network connectivity problem between domain controllers.

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