Operation not supported. Protocol family not supported. Address family not supported by protocol family. If you attempt to set up a server on a port that is already is in use, you will get this error. Cannot assign requested address.
Network is down.
Network is unreachable. Software caused the connection to abort. A connection that has been made was aborted, usually due to connection or protocol error. Connection reset by peer. This occurs when an established connection is shut down for some reason by the remote computer.