I have a MOSS 07 FBA site at https://fba.mydomain.com. I have a classic ASP site on the same server at https://asp.mydomain.com. When I access https://asp.mydomain.com in the browser, it redirects to the login form at https://fba.mydomain.com/_layouts/login.aspx. This is very strange. The two things are completely different sites in IIS. I looked accessed https://asp.mydomain.com and I see it is producing a 302 redirect code. If I access http://asp.mydomain.com (without SSL), it loads as expected.
I'm not even sure where to focus my effort. Could this be AAM, IIS, or a problem with the IP? (I've confirmed that it's not the ASP code.)