FiveM error ECONNREFUSED 127.0.0.0:3306
If you got this error: 
Then you did not setup the mysql_connection_string right. The database IP can never be 127.0.0.1
To fix this:
Open your server.cfg
Create a database if you did not do that yet and save/remember the database details. How to create a database
In the mysql_connection_string, add te following behind this:
server= add the IP of your MySQL server (You can find this under the tab databases in you control panel)
uid= add the username of your mysql database
password= add the password of your mysql database
database= add the name of your database
The new mysql_connection_string should be something like this:
Then you did not setup the mysql_connection_string right. The database IP can never be 127.0.0.1
To fix this:
Open your server.cfg
Create a database if you did not do that yet and save/remember the database details. How to create a database
In the mysql_connection_string, add te following behind this:
server= add the IP of your MySQL server (You can find this under the tab databases in you control panel)
uid= add the username of your mysql database
password= add the password of your mysql database
database= add the name of your database
The new mysql_connection_string should be something like this:
set mysql_connection_string "server=151.80.54.190;uid=userhere;password=passwordhere;database=s1_databasename"Updated on: 03/06/2020
Thank you!