Do the following if you ever face any issue like “Session Invalid or Expired” when logging into RoundCube.

1. Log in to the server.

2. Access the following file.

/usr/local/cpanel/base/3rdparty/roundcube/config/main.inc.php

3. Comment the line.

$rcmail_config['session_lifetime'] = 10;

( It is not recommended because session timeout is a security feature. You can also try to increase the default value – 10 to a higher value. )

4. Save the file.

That’s it!! That’s how you fix Session Invalid or Expired RoundCube issue.