https:// getting redirected to http://xxx:443

I see some others have viewed this question, thought I'd post what our fix was although we never completely determined what was causing the issue. A change was made in the IIS rewriter to deal with a request that came in with the http://foo.bar.com:443 format so that it did not return the 503 error. Also, we turned off redirect caching in the AAM/WebAccel policy. As far as we could tell there was some condition that caused the IIS rewriter to very rarely return the bad redirect, and then the issue was amplified by AAM caching that redirect.