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one of the links in that thread is wrong.
should be:
http://www.powertoolsforum.com/modules/xoopsfaq/index.php?cat_id=2q5q5This one explains how your users should set there firewall
I think there also is a way to change the http referrer code in XOOPS somewhere,
Xoops has increased security, I understand that 90% of the logins problems are related to bad settings in the user firewalls
Edit: developers dont recomend this but a way or hack
Hereedit: need to find out which versions are causing this, looks like older versions from the posts?