I met with a strange problem with my Joomla site. The login page does not remember my authentication session (both in IE and Firefox). However it works well when I am using other network connection.
After some search on google, I realized it is a bug from Mambo 4.5.2.3, which Joomla 1.0.x is based on. The temporary workaround is to check the “remember me” in the login module. This does not happen before with all Joomla from 1.0.0 to 1.0.4. 