How to update DNS name of DCC

I have a DCC instance that sits behind an IHS reverse proxy server at jts.myurl.com/dcc. It is reachable at that address in a browser. However, the DCC application is really running on a machine accessible directly (not going through IHS) at dcc.myurl.com:9443/dcc. The problem is that DCC thinks that it is at dcc.myurl.com:9443 - that's the URL it provides in the SCR file. So if a user begins their session by attempting to log in to DCC at jts.myurl.com/dcc as the first application they hit, they receive a browser error (Error 403: Requested redirect url is not trusted). However, if they first log in to JTS at jts.myurl.com/jts/admin, and then navigate to jts.myurl.com/dcc, the user wouldn't know anything is misconfigured.