Forum OpenACS Q&A: Hiding the port 8000 to appear from URL when logging in
Refer to my earlier posts to you: http://openacs.org/forums/message-view?message_id=3580626#3584663
In order to get this working, you're going to have to upgrade OpenACS to a newer version that has a working version of SuppressHttpPort parameter.
grab the related code from Head version of these two files:
I checked 5.5.1-2 is the version I am using on Lucid.
On the Home page of OpenACS, there's a link to download OpenACS 5.6.0
The easiest thing to do would be to update to this version, to be sure to get all the changes.