Hi @Hugo
You are seeing the same problem as this thread: Error Trying to Add Database
Resolution was to re-enter the information and then it started working. I don’t know where the problem comes from, but I have a feeling that it might be a browser password manager that is doing something.
Alternatively try with a manual SSH tunnel outside of Metabase:
https://www.metabase.com/docs/latest/administration-guide/01-managing-databases.html#what-if-the-built-in-ssh-tunnels-dont-fit-my-needs
And you should migrate away from H2 if you are using Metabase in production:
https://www.metabase.com/docs/latest/administration-guide/01-managing-databases.html#what-if-the-built-in-ssh-tunnels-dont-fit-my-needs