Can't connect to MySQL without SSL

Hi!

I try to migrate from dovecot 2.3 to dovecot CE 2.4, but within a docker container. But I always get the following error from Dovecot CE:

Error: auth: mysql(host.docker.internal): Connect failed to database (foobar): TLS/SSL error: self-signed certificate in certificate chain - waiting for 1 seconds before retry

This is how I configured the mysql connection:

mysql host.docker.internal {
  host = host.docker.internal
  port = 3306
  user = ...
  password = ...
  dbname = foobar
  ssl = no
}

So MySQL runs on the host machine directly, not in a container - therefore I'm using "host.docker.internal" as an host. But I don't need SQL encryption, since both MySQL and Dovecot run on the same machine. So why the heck does it look like, Dovecot is trying to connect using SSL?

Best regards,
Billie
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