I was only able to repro this with a GCP Cloud SQL MySQL db when client cert security was enabled on the database. We don't currently support this, can you confirm that this is what you're trying to do?
Got it, thanks, authorizing makes it seem like there's either an issue in the pw auth or certs configuration. Can you confirm that you can connect with other clients?
We'll need to look more into this, because what we've seen in trying out various MySQL providers, a lot of them implement different and sometimes outdated authentication plugins and we may need to look into your specific set up https://dev.mysql.com/doc/refman/8.4/en/authentication-plugins.html
We see this error message when the database is configured to require client certificates from Hyperdrive, can you detail how you have the --ssl-verify-client-cert flag configured?
Excellent, thank you @mariano for sharing all of the details of your testing, we're going to be iterating on MySQL support to also support custom certs in the coming months cc @AJR for awareness
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