Hmm ... 443 is the standard port for https! Are you sure that the client are using http and not https?
There is no port redirekt in JBoss (use a local firewall instead)
There is nothing that stops you from specify a NEW http connector in server.xml that binds to 443 (if you are allowed to open such a "low" server socket that is). The new connector should be possible to use in parallell with the 8080 one.
Look in the documentation what "redirectPort" means!
I still think that the client tries to use https....
If the client insists on HTTPS it will not help to start a HTTP connector on port 443. I would enable the prepared https connector and change the port to 443 instead of 8443. (You need to have a keystore to use though)
Or use port forwarding in the local firewall (if any) or operation system to redirect 443 to 8443.
The easiest solution is of course to change the client, but I guess that would be to easy ;-)