Discuz! info: Can not connect to MySQL server

Time: 2018-10-21 4:28am
Script: /trip-to-cairo-and-luxor-2-days-from-hurghada-by-flight-t1275805.html

Error: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (11)
Errno.: 2002

Similar error report has beed dispatched to administrator before.