I changed one of my netware server to another box, all fine but when users
log in they are getting "LOGIN-LGNWNT32.DLL-890:The specified server is
unknown" and it tries to map several drive mapping to C.

slp setting is correct both on server and clients
client is 4.91 3.20061109 .
I have installed 491psp1_calwin32.exe and 491psp2_novnpnt1.exe

Apart from this the users are complaining that file access is slow.
Utilization is normal between 0% and 1%