Hello,
I have a Windows Server 2012r2 running ADDS, DHCP, DNS and DFS - during overnight backup, I receive the following errors:
ID: 510 - ESENT ERROR - request to write to file to an abnormally long time (562 seconds)
ID 1014 - DNS Client Events - Name resolution timed out after none of the configured DNS servers responded
ID - 1006 - Group Policy - processing of group policy failed - Windows could not authenticate to the Active Directory service
ID 7011 - Service Control Manager - A timeout (3000 milliseconds) was reached while waiting for a transaction response from the client manager service
Also, during this time the server becomes very slow to near unresponsive. Important to note that these errors only produce themselves during the backup operation, and the backup operation does complete successfully.
I noticed that some of these strange issues started to appear after we started using DFS - this server replicates files to another server using DFS.