The network layer was unable to determine a socket's local name. In a TCP/IP connection, each end of the connection has a socket exclusively attached to a port. A socket's local name includes this port number, which is assigned by the network at connection time. Check the following: 1) The machine is still connected to the network, and the network is responsive. 2) The other side of the connection is running normally. 3) There are enough system resources available. Free up system resources if they are running low.