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[Thu Feb 11 02:03:48 2016] [error] [client] PHP Warning:  mysqli::mysqli(): (HY000/2002): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2) in /var/www/vhosts/spaceamigos.com/httpdocs/qa-include/qa-db.php on line 66
Q2A version: 1.7
It means PHP can't connect to your database. Either the login details are wrong, or MySQL isn't running. Is this occurring on a specific page?

Maybe this will help: http://stackoverflow.com/questions/13769504/mysqlimysqli-hy000-2002-cant-connect-to-local-mysql-server-through-sock
The whole site was unavailable.
I rebooted the server and then the site back up and running.
However, in busy times it becomes unavailable again.

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