About MySQL error 2005-unknown mysql server host ' localhost ' (0) cause and workaround

Today in the outside open navicat for MySQL, how can not even on their own local database, has been shown 2005-unknown MySQL server host ' localhost ' (0):

The error code means that the host localhost cannot be connected. May be caused by the lack of networking, so the connection properties in the ' hostname or IP address ' changed to 127.0.0.1 that is the loopback address, you can connect. Baidu Search, Navicat some of the features should be networked, and localhost is required to DNS resolution will be 127.0.0.1, so it will lead to this phenomenon.

About MySQL error 2005-unknown mysql server host ' localhost ' (0) cause and workaround