“Error establishing a database connection” often

Encountering “Error establishing a database connection” very often after upgrading to version 6, nothing happened during any version 5.

Hosting multi-site on centos7 server with NGIX, it’s interesting not all sites encountered such problems.

and all recovered after rebooting the server.

all of database, password and username are correct, don’t what happened.

• This topic was modified 2 years, 1 month ago by ericy2218.