Symptoms

Inspite of the site itself is published correct, you got the error:

Unable to connect to Web Presence Builder server. Please contact the server administrator.

In the tmp/sitebuilder.log

[EMERG] [System]        /JsonApi/       Base_SyntaxException: PHP Warning : PDOStatement::execute(): MySQL server has gone away
file: /var/www/vhosts/4/100809/webspace/siteapps/530/htdocs/include/Zend/Db/Statement/Pdo.php

Cause

Timeout defined in the my.cnf was exceeded.

Resolution

Increase wait-timeout configuration directive in /etc/my.cnf and restart MySQL server.

Internal content