So this is wierd --

Checking out errors in the Event Log of one of our client's servers, and it has a lot of those notorious DNS 5504 errors. I know how to troubleshoot them when the IP address belongs to an ISP or other server, but the wierd thing here is that this particular server is using its own IP address for DNS forwarding (no other IP addresses listed). So how could it get an invalid domain name from itself? Is it even plausible to use a server's own IP address for DNS forwarding?

For those unfamiliar with 5504 errors, here is the actual description:

"The DNS server encountered an invalid domain name in a packet from x.x.x.x The packet is rejected. "