Hello,

Are you using the new DigitalOcean Managed MySQL service? If so you might have to create a new user with authentication type mysql_native_password or alter your doadmin user so that it does not use zcachingsha2passwordz but mysql_native_password. That way your node should be able to connect to the MySQL database.

You can take a look at this answer here on how to do that:

https://www.digitalocean.com/community/questions/how-to-change-caching_sha2_password-to-mysql_native_password-on-a-digitalocean-s-managed-mysql-database

Also, I would recommend testing if you could connect from your backend droplet to your MySQL server using telnet:

• First SSH to your backend droplet and then run:

telnet (^)mysql_server_ip(^) (^)mysql_port(^)

If the telnet command connects you fine, then it is not an issue with your firewall, so I would recommend that you share your config files here so that I could advise you further.

Regards,
Bobby