Can't log on to a NT 4.0 Stand alone Server

[hectrami]

I have a problem with Loggin on to one of my Stand alone Servers that is located on a DMZ. The Internal Network and the DMZ is separated by a PIX firwall. The error I keep getting is: No domain controller for your domain could be contacted. You have been logged on using cached information. I hit ok and I can browse the network to and from the DMZ. I have Exchange and RightFAX running on this machine and no one can logon to exchange. I can ping and tracert to and from the DMZ, by IP address and by server name. in the event viewer i get a netlogon error saying that no domain controller is available form my domain. there are currently no logon servers available to service the logon request. Any ideas would be appreciated.
Thanks

 

[mkalk]

One reason might be that you've blocked the UDP port 138 (Netlogon service) on PIX Firewall, by mistake.

http://www.microsoft.com/technet/tr.../exchange/reskit/ex00res/resguide/appendb.asp