How to stop this websocket service？

[ruyudeshuileling]

server.ListenerSocket.Close();
server.ListenerSocket.Dispose();
or
server.Dispose();

None of them work

[AdrianBathurst]

When I restart the websocket service, I close all existing socket connections then call server.Dispose() and that works ok.
server.Dispose() in turn calls ListenerSocket.Dispose() so no need to call that.