System.Net.Sockets.SocketException: No connection could be made because the target machine active (4288238)

When you launch group policy manager and try to connect you get the following error:

System.Net.Sockets.SocketException: No connection could be made because the target machine actively refused it serverip:40200

Server stack trace:
at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress)
at System.Net.Sockets.Socket.Connect(EndPoint remoteEP)
at System.Runtime.Remoting.Channels.RemoteConnection.CreateNewSocket(EndPoint ipEndPoint)
at System.Runtime.Remoting.Channels.RemoteConnection.CreateNewSocket()
at System.Runtime.Remoting.Channels.SocketCache.GetSocket(String machinePortAndSid, Boolean openNew)
at System.Runtime.Remoting.Channels.Tcp.TcpClientTransportSink.SendRequestWithRetry(IMessage msg, ITransportHeaders requestHeaders, Stream requestStream)
at System.Runtime.Remoting.Channels.Tcp.TcpClientTransportSink.ProcessMessage(IMessage msg, ITransportHeaders requestHeaders, Stream requestStream, ITransportHeaders& responseHeaders, Stream& responseStream)
at Quest.Avalanche.Interfaces.UICultureClientChannelSink.ProcessMessage(IMessage msg, ITransportHeaders requestHeaders, Stream requestStream, ITransportHeaders& responseHeaders, Stream& responseStream)
at Quest.Avalanche.Interfaces.CompressionClientChannelSink.ProcessMessage(IMessage msg, ITransportHeaders requestHeaders, Stream requestStream, ITransportHeaders& responseHeaders, Stream& responseStream)
at System.Runtime.Remoting.Channels.BinaryClientFormatterSink.SyncProcessMessage(IMessage msg)

Exception rethrown at [0]:
at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
at Quest.Avalanche.Interfaces.IVersionControlManager.CheckLicense(Boolean throwException)
at

This can happen because the default group policy manager port has been changed and is no longer using port 40200.

open the registry on the group policy manager server and navigate to the following key:

HKEY_LOCAL_MACHINE\SOFTWARE\Quest Software\Quest Group Policy Manager\Remoting

check the port is the same as you are trying to connect to, be default this is 40200.