System.Net.Sockets.SocketException (0x80004005): each socket address (protocol / network address / port) only once.
In System.Net.Sockets.Socket.DoBind (EndPoint endPointSnapshot, SocketAddress socketAddress)
in System.Net.Sockets.Socket.Bind (EndPoint localEP)
Port is found to be occupied by another program, this program can be shut down
cmd in
netstat -ano find the port corresponding pid
tasklist | more to view the corresponding program to the end of the process