Re: Error connecting through SSH Tunnel

[Georgi Kodinov]

One possible explanation could be because you're using two different connectors with different defaults for ssl.

I assume you're on 5.7 (server and client), right ?

5.7 does enable SSL on the server when installing a new database. And the 5.7 native client does by default run with --ssl-mode=optional (meaning: do SSL if supported).
So I will not be surprised if your "non-web-application" tests do SSL on top of SSH.
It's easy to check: "/s" in the client returns the currently used encryption cipher (none if no SSL).

Whereas your web app is probably running without SSL because of the PHP connector probably doing the equivalent of --ssl-mode=disabled.