I have 3 servers running CIFS on NW 6.5.6 with latest CIFS (3.25b)

The 3 servers are connected by VPN and each are on their own network.

PDC - Server A -
BDC - Server B -
BDC - Server C -

I am able to add PCs on the 192.168.100.x network without problem.

When I try to add a PC located on the 192.168.1.x or 192.168.10.x
networks to the domain, it comes back with the error :

"The following error occurred attempting to join the domain "abc_domain"
"The specified domain either does not exist or could not be contacted"

The only way I could get this to work was to enter the WINS address of in the Advanced network settings of the PC.

Notes :

1. I did put as the WINS address on the BDC CIFS servers.

2. CIFS DOMAIN LISTDC shows everything as OK.

3. In iManager, though, there is no PDC information showing in the
Authentication tab.

I would prefer to no have to enter a WINS address in the network

Is there a way to have this work transparently.