I have a small workgroup (consits of WinNT4.0 and Win98) on my LAN. All of them belong to workgroup CAD. Recently, I just set up a Samba server which is configured as a member of workgroup CAD. From the Network Neighborhood I can see the CAD workgroup but somehow I can not access the workgroup. The system gives error message as below:
CAD is unaccessible, an unexpected network error occur

I can ping all the workstations and the server without fail. What went wrong? (Mapping network drive from the Samba server can be done on winNT workstations)