(HACK) Prevent Firewall login
If the stated goal of XOOPS is to "...create a Content Management System (CMS) for users and developers that installs out of the box offering unparalleled ease of use, support and management." then wouldn't it be great if it worked for users as well... even the odd balls (irony) who choose to run with a firewall?
Actinic (ecommerce software) hit the same problem. They didn't say "most people don't have a problem... sorry you don't like the answer". They fixed it:
ZAP + Norton firewall problem.
If XOOPS is going to be anything other than a CMS for hobby sites it'd better react a little differently to this type of problem.