I'm using an ssl reverse proxy with modauthcas to access my dotnetnuke site from the Internet (our company uses CAS authentication).  Everything works except when I create links to local files, which manifest themselves as LinkClick.aspx with the crazy fileticket.  When I browse to such links from the inside network, not using the reverse proxy, all is fine.  When I browse from the outside through the reverse proxy, I get a 404 error like so:

Server Error in '/' Application.
The resource cannot be found.
Description: HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable.  Please review the following URL and make sure that it is spelled correctly.
Requested URL: /LinkClick.aspx

When I turn off modauthcas, the links work.  But CAS doesn't break anything else.  Any suggestions of anything I can try?

thanks,

karl