Mixed Results when Changing DNS

Cory, thanks for the reply.

To answer your first question, no. When I connect to the FQDN of "devtest.example.com" it works. My AD creds get passed and SSO works. But when I delete the CNAME in DNS, I go to "devtest.example.com" and it no longer passes my credentials.

I have a packet capture from the client, going to the server, but the results don't tell me much because I was connected to VPN at the time. I've never run a tcpdump on the Big IP.

I have a content re-write profile on the virtual server that hides the real server DNS name. It's a URI Translation, and I've made a change to it to see if it fixes the problem.