I would like to share with all that I had experienced the DPM Agent is “Unavailable” many times. Even though after uninstall and reinstall it, the next few hours later the Agent Status displays in the DPM Console as Unavailable.
After lots of troubleshooting, at last found that the Domain Controllers (DC) TIME was not in sync. Therefore, after working with the AD team to sync all their DCs, the DPM Agent is all normal and status is OK.
Lesson learn from the project is to have the AD team to check on all their DCs time is in sync and the protected servers time are in sync with the DCs.
Keywords : DPM Agent unavailable, agent not available, DPM agent change to unavailable after few hours or next day