Data Protection Manager Error id: 308

Question

I have started getting an Error on one Server. Agent status shows as unavailable in DPM Console.
I found this error on Monday and to fix it I then uninstalled the Agent and reinstalled. The problem went away for a few days, but now is back.
If I try to start the DPMRA service on client I get error: "Windows could not start DPMRA on local Computer."
Event Viewer shows:
Event 7024, Service Control Manager
The DPMRA service terminated with the following service-specific error:
An attempt was made to access a socket in a way forbidden by its access permissions.
DPM is 2012 R2 4.2.1292.0
Client is Exchange 2013 1044.25 running on Server 2012 R2
Backups are still running. I don't know if I will be able to change the Protection group though

Answer 1

If you recently installed a protection agent on <ServerName> ,
the computer may be restarting. Wait a few minutes after restarting the computer for the protection agent to become available.
If the problem persists, do the following:
Verify that <ServerName> is remotely accessible from the DPM server.
If a firewall is enabled on <ServerName> , verify that it is not blocking requests from the DPM server.
If <ServerName> is a workgroup server the password for the DPM user accounts may have changed or expired. To resolve this error, run SetDpmServer with the -UpdatePassword flag on the protected computer and Update-NonDomainServerInfo.ps1
on the DPM server.
Restart the DPM Protection Agent service on<ServerName> . If the service fails to start, uninstall the protection agent by using Add or Remove Programs in Control Panel on <ServerName> .
Then in the Management task area, on the Agents tab, in the Actions pane, click Install to reinstall the protection agent on <ServerName> .