4001	Invalid argument
4002	Error sending data
4003	Error initializing
4004	Socket library version not supported
4005	Invalid Argument
4006	System not ready
4007	Can't resolve hostname
4008	Can't get socket
4009	Error reading socket
4010	Not a socket
4011	socket is busy
4012	error closing socket
4013	wait a bit
4014	can't resolve service
4015	can't connect
4016	not connected
4017	connection refused