We have been seeing an issue more frequently where DPM cannot backup passive copies of Exchange DBs on our DAG. In the DPM console, we frequently see warnings indicating that the DPM server can’t communicate with the agent on a DAG node; we get the “agent is unreachable” error. If we reboot the server, the issue will subside for a few days but eventually return. If we let the Exchange server go, it too will eventually correct itself and DPM will eventually reconnect and back it up. I see the following error in the application logs while this is transpiring:
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I’m not finding anything online related to this error; at least not specific to Exchange and DPM. I did find this article, https://technet.microsoft.com/en-us/library/cc756369(v=ws.10).aspx where following the steps we incurred these results:
C:\Windows\system32>sc query DPMRA
SERVICE_NAME: DPMRA
TYPE : 10 WIN32_OWN_PROCESS
STATE : 1 STOPPED
WIN32_EXIT_CODE : 1066 (0x42a)
SERVICE_EXIT_CODE : 10013 (0x271d)
CHECKPOINT : 0x0
WAIT_HINT : 0x0
I can ping the Exchange server from the DPM server and vice-versa, I can set the MTU size to 1472 and ping both ways, tracecert and net view show no issues, and a wbemtest is successful. I do have ports 5718 & 5719 reserved on the Exchange servers, but if I run a netstat test on the Exchange servers I see that the “w3wp.exe” (IIS Worker Process) is using port 5718. If the recommendation is to use different ports because Exchange is using the default DPM ports, can someone make a suggestion or recommendation of what port range to use for DPM so Exchange does not interfere?
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