Auth timeout problems with CakePHP

[mydrunker]

This is really bugging me. Has been for years. No matter what I do with core.php or php.ini, my logins timeout after about an hour - usually. Some deployments of identical code and configuration timeout after a respectable amount of time.This is what I have at the moment on one site - timed out after about an hour:\[code\]session.gc_divisor 1000session.gc_maxlifetime 86400session.gc_probability 1Configure::write('Session.timeout', '28800');Configure::write('Session.checkAgent', false);Configure::write('Security.level', 'medium');\[/code\]And another - lasted all night:\[code\]session.gc_divisor 100session.gc_maxlifetime 14400session.gc_probability 0Configure::write('Session.timeout', '315360000');Configure::write('Session.checkAgent', false);Configure::write('Security.level', 'medium');\[/code\]Now, before you get excited and say, "Well, the answer is there in the Session.timeout value", let me tell you that this site usually times out after about twenty minutes!