fails:TCPSocket.new refuses the connection when there is no server to connect to
fails:TCPSocket.new connects to a listening server
critical:TCPSocket.new has an address once it has connected to a listening server
critical:TCPSocket.new allows local_port to be 0 when local_host is not specified
critical:TCPSocket.new requires local_port to be 0 when local_host is not specified
