Known good admin password does not work on /yunohost/admin

Ohhh My! that API service restart ( ```
service yunohost-api restart


Could you please shed some light on what could have happened to that yunohost instance and how this API service thingie works (or does not work :wink: )
Just curious, because no "simple" server-restart ever helped.

Anyways, thanks alot, your help is much appreciated!