Issue mariadb can't create IP socket

[madvin]

Hello
In mariadb log file I see this errors:

171021 10:38:35 [ERROR] Can't create IP socket: Success
171021 10:38:35 [ERROR] Aborting

I use Plesk Onyx 17.5.3 and mariadb 5.5.56.

 

[Bitpalast]

Could another process listen on 3306, e.g. is a second database server installed? What is the output of
# netstat -plnt | grep ':3306'
?