Unable to access the Drupal website with the error:
Additional uncaught exception thrown while handling exception
Some database operations via WordPress plugin may fail (for example, backup/restore with plugin WPVIVID)
Going to Tools & Settings > System Updates, the Plesk System Updates page might fail to be accessed with the following error:
SQLSTATE[HY000]: General error: 2006 MySQL server has gone away
Insufficient value for
wait_timeout parameters according to the article How to set the value of max_allowed_packet or wait_timeout for MySQL on Plesk server?