Sorry if this is long-winded:I have the same site running on two servers (server_old & server_new).  It's a hand-rolled PHP & Ajax thing I made for managing my inventory and loaning out equipment to customers.  It has a basic login system that is similar to the one featured on this website: How to Create a Secure Login Script in PHP and MYSQL.  So it uses PHP session variables to check whether you're logged in and forces you to the login page if not.  I didn't implement any kind of mechanism to kick you out after so many minutes or hours, at least not intentionally.Server_old is running Linux Mint 17 with Apache 2.4.7 & PHP 5.5.9, and server_new is running RHEL 7 with Apache 2.4.6 & PHP 5.4.16.I've looked in the httdp.conf & php.ini of both systems and I can't figure out why:When I'm logged into the site on server_old, my login seems to only be good for about 20 minutes of inactivity.  This makes sense if gc_maxlifetime is affecting it.  When I try to access a page after sitting idle that long, it'll redirect me to the login page.  This is good for security of course, so no complaints.Then I migrated the site and DB to server_new and I've been logged in with no activity for what seems like several hours and it's still good.  I know it's been more than 2, and I'm pretty sure more than 3 hours.  I can still manually log out and the site won't let me past the login page until I log back in, so that part is working.I just can't figure out why I get logged out of the site on Mint after a few minutes and on RHEL my PHP sessions apparently last forever.  Both servers have:session.cookie_lifetime = 0session.cache_expire = 180 (180 minutes)session.gc_maxlifetime = 1440 (1440 seconds / 24 minutes)phpinfo() reports the same on both systems.  However, on Mint the gc_probability is set to 0/1000 (essentially making it never collect the trash?) whereas on RHEL it's set to 1/1000.  You'd think that never collecting the garbage and having cookie_lifetime = 0 would mean the session would last forever on Mint.  But it's the opposite apparently.Both Apache servers have been set with the same Timeout, KeepAlive, etc also.Any ideas?
Session cookie lifetime in PHP different on RHEL vs Mint?
php;apache;linux