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Unable to uninstall Exchange 2016 even after removing it from DAG
Hi, I am unable to uninstall Exchange 2016 after removing it from DAG. Initially, I was getting an error message initially while removing the server from DAG Remove-DatabaseAvailabilityGroupServer...
I see that the Exchange server is not part of DAG, it is just that this server feels that it is still member of the DAG. I checked DAG membership servers and it is not having this server as its memberserver.
I had the exact same issue last week. If you look at the server Event Logs you'll most likely see issues with the Cluster Service. In my case the service was disabled, and wouldn't start after it was enabled. The is apparently a registry entry that you can edit as well, but it didn't exist in my case.
The only way that I got the server removed was through adsiedit, deleting it from the configuration partition, removing the computer object from ADUC and cleaning up DNS. Shut down and delete the VM.
Not the most elegant solution, and slightly risky with deleting from adsiedit and all, but it worked, with no ramification to the rest of the Exchange environment.