DFS error messages DC- 2008 R2 and 2012 R2

hi Experts,

Can you please help me fix this issue?
We are getting DFS replication error messages on servers

Event ID 2012: The DFS Replication service failed to communicate with partner <Server Name> for replication group Domain System Volume. The partner did not recognize the connection or the replication group configuration.
 
Partner DNS Address: <server Name>.<domain Name>
 
Optional data if available:
Partner WINS Address: <Wins Name>
Partner IP Address: 172.16.1.21
 
 
The service will retry the connection periodically.
 
Additional Information:
Error: 9026 (The connection is invalid)
Connection ID: 5761CCF0-7B85-4A8C-93F4-55EE19A8E4A0
Replication Group ID: 26CC0B78-4E13-46F8-87B9-F514DBB2089A


Event ID 5014: The DFS Replication service is stopping communication with partner <Server Name> for replication group Domain System Volume due to an error. The service will retry the connection periodically.
 Additional Information:
Error: 9036 (Paused for backup or restore)
Connection ID: 5761CCF0-7B85-4A8C-93F4-55EE19A8E4A0
Replication Group ID: 26CC0B78-4E13-46F8-87B9-F514DBB2089A


I am getting event ID 5004 (replication is successful) straight away after getting error message

I re created replication in AD Sites and services.

Please note that the error message is just on Secondary DC.
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ukitsmeAsked:
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Cliff GaliherCommented:
Sounds like you have a backup product that did regular snapshots and us killing DFS-R. Backing up a DC requires a backup product that's is aware of how to properly handle ADDS. Many don't, including server products, without exclusion or a specialized add-on (similar to exchange.)
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ukitsmeAuthor Commented:
hi Cliff,

Thanks for a quick response. We use a product named Shadow protect. It uses VSS. I checked other clients who have similar configuration and they don't seem to have the issue.
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Cliff GaliherCommented:
StorageCraft has KBs on how to properly configure backups for AD. While it does use VSS, there is no preconfigured exclusion for the AD database files. VSS relies on the system state writer. So backing up the files via the open file writer causes a conflict.
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ukitsmeAuthor Commented:
hi Cliff Galiher,

I uninstalled backup software on the DC, still have the same problem.
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SteveCommented:
Hi,

Are the server FQDNs & IPs correct in the error (2012) you're getting?

Do these connect over VPN and how often is AD set to replicate between these servers please?

have you made any changes to replication at either end recently?
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ukitsmeAuthor Commented:
hi Steve,

Yes FQDN and IP's are correct. Servers are sitting in the same LAN and in the same building.
When we started getting DFS error messages we deleted and recreated replication.
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SteveCommented:
Hmm. that's probably the issue. If AD wasn't replicating properly the changes you made at one end will have resulted in conflicts.

Now AD has been fixed both ends have differing information.
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ukitsmeAuthor Commented:
sfd
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Windows Server 2012

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