[drupal-support] Can't get drupal out past port forwarding

Hi -

I've been using a drupal site for a year now (for another open source project, ebase.org), but I'm setting up my own now for the first time. I've got the site all built, and when I tried to go live I found I can't get it out past my router!

Details at: http://drupal.org/node/19574

Basically, apache's confirmed working successfully on a port other than 80, and drupal works fine on this port on my LAN, but from outside it doesn't work. I've searched the archives both of this list and of the support forums, but not found any post that deals with my specific situation.

Does anyone know what the solution is, or what additional questions I should ask/answer to find one?

Thanks very much, Allen