[horde] Horde SSL issue

[Nathan Mills]

I'm having a problem using SSL with Horde (Groupware Webmail Edition 1.0 to 
be exact).

I've configured my Apache server for SSL. For some reason, when trying to 
access Horde over SSL the navigation frame loads OK, but the main frame 
does not. Horde rewrites the url to 
https://my.server:80/horde/login.php?frameset_loaded=1.

Thanks to the spurious :80, the main frame does not load. Oddly, most of 
the links in the navigation frame work fine (excluding the top level Mail 
link, which has the proper URL in the link, but redirects to the broken 
version with the spurious :80), so it's really only an issue of the initial 
redirect.

I have $conf['server']['port'] set to $_SERVER['SERVER_PORT']. I checked 
using phpinfo() that SERVER_PORT is indeed getting set to 443 when using 
https and 80 when using http on the default ports. $conf['use_ssl'] is set 
to 2, which I understand causes Horde to auto detect whether it should be 
using http or https urls and the correct port.

I'm using Horde Groupware Webmail Edition FWIW, although I don't see why 
that would make a difference. I previously (several months ago) tried to 
configure the same setup on another server running the latest (at the time) 
HEAD code with the same results.

Am I missing something?

Thanks,
-Nathan