How to set session timeout limit for frontend users in joomla 2.5? I had set the Session Lifetime option in Global configuration but it sets the limit in backend only.
you can comment the line JHtml::_('behavior.keepalive'); on top in the file
modules/mod_login/tmpl/default.php
After that the time from the backend will also expires the frontend as well as backend
Try this plugin. According to my knowledge.
If you are to
Session Control Plugin make the different session lifetime for different user group on your Joomla site. Session Control Plugin make the user group online all the time on your Joomla site.
Other option
Go to Site -> Global configuration -> System tab and set the Session Lifetime
From my tests I have the opinion that the value you set in back-end (Global Configuration > System > Session Lifetime) is used for back-end as well as for front-end.
You may want to check that value you are getting in frontend. Use the code below:
echo "Session will expire in " . JFactory::getSession()->getExpire() / 60 . " min.";
It looks to me that JFactory is responsible with setting the expiration time. It uses the config time or if absent it uses 900 seconds (15 minutes).
来源：https://stackoverflow.com/questions/13133191/set-frontend-session-time-out-limit-in-joomla