I use blue fang solutions for a host.
The error I get is "invalid database name" and the occasional "Couldn't connect to MariaDB Database" with sprinkles of "Database IP address **** is from a private range and can't be used here."

Local_config file looks like this (obviously I replaced the actual info with asterisks).:

$cm_config::DB::Connect::server = "****"; // server IP or domain name. Can enter port if it is not default
$cm_config::DB::Connect::user = "****"; // MUST be a user with ROOT privileges in order to create new DBs
$cm_config::DB::Connect::password = "****"; // password for that user

That is the entire file copy and pasted.

use the IP adress from hoster, not the loopback 127.0.0.1