We're on Exchange 2013 CU5. DPM Exchange backups started to fail after applying patches to our database server. We can successfully back up databases when we fail the DBs over to another DAG member. But we cannot back up databases that are active on our primary DAG member.
Here's the event we receive when the backup fails:
A VSS writer has rejected an event with error 0x800423f4, The writer experienced a non-transient error. If the backup process is retried,
the error is likely to reoccur.
. Changes that the writer made to the writer components while handling the event will not be available to the requester. Check the event log for related events from the application hosting the VSS writer.
Operation:
BackupComplete Event
Context:
Execution Context: Writer
Writer Class Id: {76fe1ac4-15f7-4bcd-987e-8e1acb462fb7}
Writer Name: Microsoft Exchange Writer
Writer Instance Name: Exchange Replication Service
Writer Instance ID: {7f0d1952-0a18-429d-b778-34e6b19efc65}
Command Line: "C:\Program Files\Microsoft\Exchange Server\V15\Bin\msexchangerepl.exe"
Process ID: 10488
Any thoughts on how to troubleshoot?