I have been trying to hardening my domain even better. I started setting it up in vhost (/etc/Apache2/sites-enabled/site_in_question) with: Header always set Strict-Transport-Security "max-age=10886400; includeSubdomains; preload" set in the <VirtualHost:443> block. It worked fine, but then I had to make a new subdomain, and discovered that the addition of the Header vanished. So I decided to put it directly in ISPConfig's Apache directive for the domain. Bad decision, it seems. Now I'm completely unable to get in touch with any of my domains on the server including ISPConfig. How can I revert to a point where I can get in touch with my ISPConfig again. Is it possible somehow to get into the database and delete that Header directive? And how?