Windows servers in Azure aren’t any different from Windows servers in a different environment. We use BP on Azure servers all the time. ‘RPC server is unavailable’ generally indicates a firewall problem or a network communications issue of some kind. It essentially means that the BatchPatch computer is not getting a response from the target computer, and it’s the same error that you would get if you input a non-existent target computer into a row in the BP grid.
Troubleshooting Common Errors in BatchPatch