How to increase the timeout limit of a login session in phpMyAdmin

Connect to the server via SSH

Go to the file path /usr/local/psa/phpMyAdmin/:

# cd /usr/local/psa/phpMyAdmin/

Create the file config.inc.php if it doesn't exist copying the template file libraries/config.default.php:

# if [ ! -f config.inc.php ]; then cp -a {libraries/config.default.php,config.inc.php}; fi

Edit the file config.inc.php with a text editor: 

# vi config.inc.php

Change the value of the parameter LoginCookieValidity:

$cfg['LoginCookieValidity'] = 1800;

Save the changes and close the file

Connect to the server via SSH

Go to the file path /usr/local/psa/admin/htdocs/domains/databases/phpMyAdmin/:

# cd /usr/local/psa/admin/htdocs/domains/databases/phpMyAdmin/

Create the file config.inc.php if it doesn't exist copying the template file libraries/config.default.php:

# if [ ! -f config.inc.php ]; then cp -a {libraries/config.default.php,config.inc.php}; fi

Edit the file config.inc.php with a text editor: 

# vi config.inc.php

Change the value of the parameter LoginCookieValidity:

$cfg['LoginCookieValidity'] = 1800;

Save the changes and close the file

Connect to the server via RDP

Go to the following folder path: %plesk_dir%phpmyadmin

Create or edit the file config.inc.php with a text editor

Add or change the value of the parameter LoginCookieValidity and save the changes:

<?php
declare(strict_types=1);
// ...
$cfg['LoginCookieValidity'] = 1800;

Edit the Plesk PHP.ini file %plesk_dir%adminconfphp.ini with a text editor

Add or edit the parameter session.gc_maxlifetime in the [Session] section with the same value configured in LoginCookieValidity and save the changes:

...
[Session]
session.gc_maxlifetime = 1800
...

Log out from phpMyAdmin and Plesk to start a new PHP session

Connect to the server via RDP

Go to the following folder path: %plesk_dir%adminhtdocsdomainsdatabasesphpMyAdmin

Create or edit the file config.inc.php with a text editor

Add or change the value of the parameter LoginCookieValidity and save the changes:

<?php
declare(strict_types=1);
// ...
$cfg['LoginCookieValidity'] = 1800;

Edit the Plesk PHP.ini file %plesk_dir%adminconfphp.ini with a text editor

Add or edit the parameter session.gc_maxlifetime in the [Session] section with the same value configured in LoginCookieValidity and save the changes:

...
[Session]
session.gc_maxlifetime = 1800
...

Log out from phpMyAdmin and Plesk to start a new PHP session