No fax printers are available

Hello

I have a terrible problem about FAX:

I have 1 Windows 2003 SP1 + 5 workstations.

Server is: Windows 2003 SP1 + all hotfixes and patches
Server role: File-Sharing (a couple of folders shared via NETBIOS) and FAX
(56k serial V92 modem on COM port)

Clients: n°4 XP PRO SP2+ all hotfixes and n°1 W2000 SP4 + all hotfixes)


Only 1 XP Client correctly connects to the fax console and can send faxes.
The other client got this error

"no printer fax are available" and they wont work.

I have tried with a popular registry key faxfix.reg that works on four
registry keys named RPCProxy, but I already got that keys..

No worm, no firewall on the lan, all patched and updated but I still cannot
use fax.

Any suggestions?

I havent found any help yet.

Thank you