phpBB Error: Can't connect to local MySQL server through socket Error

I was transfering phpBB forum from one hosting to another and experienced the phpBB Error:

"Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2 "No such file or directory") [2002]"

I was using local database on the old hosting and on the new hosting I wanted to connect to MySQL on the remote server. The problem was that config info on the new hosting was cached.

Solution
Open the /cache folder on the new server and delete all except .htaccess and index.htm. Than make sure you have a correct info in the config.php file(you can check it here: https://www.phpbb.com/support/docs/en/3.0/kb/article/rebuilding-your-configphp-file)