Newbie: Trying to ssl-wrap Plone4 using non-standard port

[Johannes Graumann]

Hello,

I have a domain (www.graumannschaft.org) that points to a non-standard ssl-
port on a server I rent (h1616679.stratoserver.net:442), as 443 is taken by 
an unrelated Apache instance.
The server now hold a virgin buildout of Plone4, listening on 8080.
I want to wrap that zope/plone cnnetion into ssl using NGINX and hsve so fa 
the following:

server {
    listen   442;# Custom port as the standard 443 is taken by kolab
    server_name  www.graumannschaft.org;
    # SSL is using KOLAB generated credentials
    ssl  on;
    ssl_certificate  /kolab/etc/kolab/cert.pem;
    ssl_certificate_key  /kolab/etc/kolab/key.pem;
    ssl_session_timeout  5m;
    ssl_protocols  SSLv3 TLSv1;
    ssl_ciphers  ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv3:+EXP;
    ssl_prefer_server_ciphers   on;
    location / {
        proxy_pass http://localhost:8080;
    }
  }

This gets me to Plone4's "Plone is up and running. * Your Plone site has not 
been added yet ..." age just fine, but clicking the button "Create a new 
Plone Site" redirects me to localhost:8080, which unsurprisingly doesn't 
work.
I'm obviously lacking rewriting, but whatever I have tried along the lines 
of googled examples (which mostly rely n already up and running plone sites 
and plone's VirtulHostMonster), has not worked.

Can someone lease nudge me into the right direction?

Thanks, Joh