I was helping troubleshooting the 'RPC Server is unavailable' issue this week. The message was shown on a Vista client with VMRCplus connecting to a remote host. Although I have included this issue in the VMRCplus help file (VMRCplus.chm) I realized...

In this post, I assume you have configured Windows Firewall correctly to allow traffic from VMRCplus. Please read the other post if you did not. When connecting to a remote host from Vista, I got the RPC message even with Windows Firewall set up properly...