You receive the error message “Cannot start session without errors” while accessing phpMyAdmin in cPanel. phpMyAdmin will not work if any of the following settings are incorrect on a cPanel server.
1. The owner and group of /var/cpanel/userhomes/cpanelphpmyadmin directory should be cpanelphpmyadmin recursively as by default phpMyAdmin sessions are written under /var/cpanel/userhomes/cpanelphpmyadmin/sessions/ directory.
chown cpanelphpmyadmin /var/cpanel/userhomes/cpanelphpmyadmin -R
chgrp cpanelphpmyadmin /var/cpanel/userhomes/cpanelphpmyadmin -R
The 1st step should fix the issue but if it doesn’t follow the next 2 steps:
2. Change the session.save_path parameter to /tmp in the file /usr/local/cpanel/3rdparty/etc/phpmyadmin/php.ini i.e. edit the file
change session.save_path as below
session.save_path = /tmp
3. The /tmp directory permissions should be 1777, not 755.
chmod 1777 /tmp