I have been backing up two file servers in a trusted subdomain, and suddenly am no longer able to back them up with the following error as of April 25th of this year.
The DPM service was unable to communicate with the protection agent on (ID 52 Details: The encryption type requested is not supported by the KDC (0x80090342))
DPM server is 2012 R2 SP1 with latest CU (4.2.1417.0) on Server 2012 R2 which is fully patched. File servers I am backing up are 2008 R2, and 2012 R2, both fully patched as well.
Things I've tried:
- Restarting bot the DPM server and File servers to be backed up.
- Refreshing the agent (Management tab shows both agents as updated and "OK" for their status)
- Consistency Checks
- Pausing and resuming protection.
In the event logs I can see the DPM RA start on the File Servers when I perform a consistency check. I don't see any errors in the file server Event Logs. I can browse to the file servers via Windows Explorer and see all shares from the DPM server. I csn also backup the system state and BMR on a domain controller within the subdomain without issue.
Suggestions?