Source:  LOGIN.EXE

Explanation:  The workstation or user tried to attach to the server, but the server did not respond.

Possible Cause:  The server lost power or was shut off before the DOWN command was issued.

Explanation:  

When a server is brought down, the DOWN command sends a message to all other servers informing them that the server is no longer active. However, if a server is shut off before the DOWN command is issued, all other servers assume that the server is still active. In this situation, the server name still appears when the NLIST command is invoked, even though the server is no longer active. The server can be seen with NLIST up to 15 minutes after it has lost its power or halts abnormally. This error message appears if the user tries to log in to or issue a command on the server in question.

Action:  Try the command again when the server has been brought back up.

Possible Cause:  A broken or loose connection exists on the internetwork between the server and the server the user tried to attach to.

Action:  Make sure the server is connected to the network and try to log in again.