Thanks for the info. When I say multihomed I don't mean with multiple NIC's on the same local networks. One NIC is for the internal private network and the other NIC is for the external public network. Plus I disabled WINS items from binding to the external NIC. It's strange that this configuration worked fine for 6 years until just recently. I've added a few Win2K member servers the past two years or so, but that's about it in terms of server changes.
Here's a quick question. Since I haven't done it for so long I can't recall. If I want to swap roles between the PDC and a BDC while both are online, through Server Manager I demote the PDC and then promote the BDC, correct? I would like to do this without service interrupting (i.e. - reboots).
My BDC is multihomed, but it has the second NIC physically disconnected from the network (i.e. - no cable attached) and doesn't have any WINS items bound to that adapter. So in a pinch I was thinking about using it as the PDC.
What's strange is from the PDC if I try to ping one of the client workstations by name it appears to try to go out the external public NIC to resolve the hostname. It can't so the pings fail. One change I made about 3 months ago now was I had trouble with the external network due to an ISP issue. One troubleshooting step I did was reverse the IP addresses bound to the two adapters in the PDC. The private IP was originally bound to the first NIC and the public IP was originally bound to the second NIC. I reversed them where the public IP now is on NIC #1 and the private IP is now on NIC #2. But I reversed the WINS bindings so the items are still only bound to the private IP NIC.
Maybe I can swap these IP's back as something to try? I've tried tweaking the registry settings for the browser service, restarting the browser services when they eventually fail, retarting WINS and Netlogon on the PDC, etc.
This is definitely a pain...