[RCU] Session timeout not working as expected

[Javier de Miguel Rodríguez]

Hello

I am running Roundcube 1.4.5 in Centos 7, apache 2.4.6, memcached 1.4.15 &
php 7.3.17. I want to set a session timeout in Roundcube, an idle user
should be kicked off after 20 minutes of inactivity.

I have this setting in config.inc.php

$config['session_lifetime'] = 20;

In php.ini I have this relevant settings:

session.gc_probability = 1
session.gc_divisor = 1000
session.gc_maxlifetime = 1200

I have read several times doc & bug tracking reports of this feature and
this setting should work. Somebody can tell me what am I missing?

Regards

Javier
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