To determine the cause of Error 53 when connecting to a server
1. If the computer is on the local subnet, confirm that the name is spelled correctly and that the target computer is running TCP/IP as well. If the computer is not on the local subnet, be sure that its name and IP address mapping are available in the LMHOSTS file or the WINS database.
Error 53 is returned if name resolution fails for a particular computer name.
2. If all TCP/IP elements appear to be installed properly, use ping with the remote computer to be sure that its TCP/IP software is working.