When your W95 client uses DUN to access a Windows NT RAS server, they may encounter some/all of the following:
No domain controller available to authenticate your password.
Network path invalid
System error 53 has occurred
Request timed out
Your other clients do not experience the problem.
The above behavior can be caused by failure to re-apply your latest service pack to the RAS server, after performing an operation that required files from the NT server CD-ROM.