Lidgren 第二次创建服务器实例导致 System.Net.Sockets.SocketException

Question

I am using Lidgren in Monogame. There is a possibility that a player would want to host a game, then exits the lobby, and wants to host again. However, when I do this in my code, the following exception is raised: System.Net.Sockets.SocketException: 'Only one usage of each socket address (protocol/network address/port) is normally permitted'

Relevant code:

// initializing the server
NetPeerConfiguration _config = new NetPeerConfiguration("some app id");
// code to enable certain messages.
_server = new NetServer(_config);
_server.Start();

// cleaning up the server instance
_server.Shutdown("server shutdown");
_server = null;

The code crashes at _server.Start() with binding the socket.( m_socket.Bind() ).

How can I clean the server/socket up so that I can create a new instance of the server a second time around?

Answer 1

The cause of this is an improper shutdown of the previous server's instance meaning the port is still in use by that instance. Seems to have been a bug, the internal cleanup didn't work properly https://github.com/lidgren/lidgren-network-gen3/issues/94 https://github.com/lidgren/lidgren-network-gen3/issues/94#issuecomment-369561026 however it was fixed so be sure to have the latest version of lidgren-network https://github.com/RevoluPowered/lidgren-network/tree/feature/socket-overhaul

you can use _server.Socket.Close(); just to be sure the socket closes before starting another server or instance.