Should I add the IP of the server that hosts my sites to the list of authorized IPs in the wp-admin/.htaccess?

Should I add the IP of the server that hosts my sites to the list of authorized IPs in the wp-admin/.htaccess?

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)