I've got a brand new VPS Plesk 300 . Trying to upgrade the Plesk 8.3 to either 8.4 or 8.6, I got the message "Failed to check whether a new license key is available" so I did Parallels Article ID 3543 to fix that but now I continuously get:
MySQL query failed: MySQL server has gone away
db_query(string 'SELECT id, type, url, priority, enabled, auth_required, login, password FROM ai_vendor_sources')
AutoInstallerManager->install(string 'PLESK_8_4_0', array, boolean false, string 'XXXXX@domain.com', boolean true)
This is a brand new set-up done just today! I monitored the /var/log/mysqld.log for anything but nothing.
Help! I got this new set-up because I'm trying to do a server migration so that I can upgrade my Plesk (my old server had gotten way too personalized for Plesk).
Haven't found a solution on Parallels website either.