I have been tasked with re-homing sites off of our old Server 2008 host. I have sucessfully migrated all the sites but one.

we use a DNS Alias that points to the correct server so users are not constantly having to update book marks. On the old server if you http://SERVER1 you get the site, however on the new host it is redirecting back to the old server. If I go http://SERVER2/Portal I get the site.

I am able to do a nslookup, and can ping by hostname and that all is resolving fine.

I am at a loss, because everything in the IIS Configuration looks identical.

Thoughts on what the issue is?