>One of my clients has an NT 4.0 server with DOS, Win95, Win98 and NT workstations. Everything is fine except:
>
>DOS work station Fran (computer name and user name in system.ini) works fine until DOS work station Larry (computer name = Other and user name = Larry in system.ini) tries to log on.
>
>We then get one of two errors:
>A. Drive door is open
>or
>B. Network reading drive f:
>
>
>We've checked the system.ini and autoexec.bat to see if there
>are any Computer Name is the Same as another work station type
>issues, but cannot find them.
>
>Does anyone have any suggestions?

What network protocol are you using? If you're using TCP/IP with static IP addresses, have you checked to make certain that you haven't duplicated an IP address?