I am having a couple of weird DNS issues. I am running a DNS server that serves one of our office locations on my Win2K Server Domain Controller. All my client computers are DHCP-enabled and we use a private address range that gets translated at ourn firewall. I have my internal DNS server pointing to itself for it's DNS server as well.
The problem... we have been running this configuartion for 9 months now without any serious problems except for this very annoying one. There are two (probably more but two that I know of) web sites that we cannot access. If I change the DNS server address (on a client machine) to point to an external DNS server provided by our ISP, the site can be accessed. If I point the current DNS server (internal) to point to these external servers, the server itself can access the sites but not the client machines.
This is probably a bit vague but does anyone have any ideas. The client machines are mostly 2000 Prof with a few NT 4.0 mixed in and all network servers are 2000. It's confusing as it's only two sites and I'm sure the office has hit thousands of sites without problems.
Any help/suggestions would be appreciated.