MediaWIki Session idle time

in one mediaWiki project it happens to me that after a user has been idle for some period (like 20 minutes) he gets automatically logged out.

I have already tried to set in LocalSettings.php $wgCookieExpiration = 60*60*24*365; and $wgCookieExpiration = 0; but it does not se开发者_JAVA技巧em to work, I still get logged out.

I have tested this in Chrome and Firefox.

Any ideas ?

Try to eliminate possible causes:

1. Did you login on the same pc with another account? Does it also time out after 20 min?
2. Have you tried using the account on a different pc, do you see the same problem?

I've had issues with mediawiki sessions before,that disappeared after an Apache reboot. Did you try rebooting Apache?