Exchange 2013 sp1 affects OWA access on substandard port

Question

Prior to SP1 i was able to run owa on port 9443. This is now an issue on sp1.
From testing what i have found is that when you access owa on a substandard port you are redirected to the auth/logon.aspx page on port 443 despite the fact that you accessed the site on a different port. After i login to the auth page i am correctly redirected
back onto port 9443. The issue is that the environment i am in does not permit me to port forward 443 to the server therefore owa no longer works in this circumstance. I tried playing with urlrewrite but i believe there is a module in exchange that is fighting
the rewrite. Is it possible to have this addressed? Assuming port 443 for the login page seems like a mistake since i am able to specify the port in the external url address for all services.

Answer 1

ya that is already done definitely not a binding issue, basically the site works on 9443 but there is an assumption of port 443 in a few key areas.
if i goto https://fqdn.com:9443/owa it redirects me to https://fqdn.com/owa/auth/logon.aspx on port
443 if i do this from the outside world i get a 404 because i cannot forward port 443 to my test server(isp blocks 443)
if i manually go to https://fqdn.com:9443/owa/auth/logon.aspx i can log in and everything works fine. if i type my password in wrong i get redirected to 443 again though and it breaks my external access. whatever redirects you to the auth/logon.aspx
part has some logic that no longer takes into account a substandard port. it worked prior to sp1. 
based on this i am either hunting a setting somewhere, or i need advice on maybe using urlrewrite to circumvent the behaivor so that iis doesnt revert to 443 when exchange incorrectly does.
for the time being this is a test box accessed only by me, so i can live with linking directly to the logon.aspx page on 9443, i would just like to resolve it if i can, or atleast determine this is intended behavior and substandard ports are no longer supported.
there are kbs published by microsoft for changing owa ports on exchange 2010 so it doesnt seem like the process is all that unsupported.