Unfortunately every time I try to browse to beyond the upgrade.mysite.com home page, it redirects me to the site root, www.mysite.com/Default.aspx?TabID=someTabID. This page doesn't exist. As far as I can tell, the IIS settings are identical between the live and upgrade site and no hidden redirects are anywhere in the files.

What's weird is that I can actually login as host to the upgrade site and browse around to all the host pages and edit as needed. But when I try to go to the Admin pages, I'm redirected towww.mysite.com/Default.aspx?TabID=someTabID which gives me that "Resource Cannot be Found" page.