Using non-standard port for TMG and Exchange/OWA

I have a configuration like this:

NLB:443 -> TMG:8443 -> CAS:443

When I goto https://NLB/owa

I get asked to do a Basic Auth. Then, I am redirected (HTTP 302) to https://NLB:8443. I have the Listener on port 8443 for HTTPS.

This does not work, since I have no service on the NLB:8443.

Is there a way to configure it (TMG or the OWA server) such that the redirect is sent to port NLB:443?

NLB = Network Load Balancer