When trying to connect using the GPOAdmin MMC console, you get the following error:
System.Net.Sockets.SocketException: No connection could be made because the target machine actively refused it
You are attempting to connect to a server that does not have the GPOAdmin service installed or the service is not running
Connect to a server that actually has the GPOAdmin service installed and ensure that it is running. If the service is running and still cannot connect, please ensure you have disabled the machines local firewall for the GPOAdmin service (or create an exception rule).