Starting KeyCloak and after them

Hello all,
I have now installed the software on a dedicated server and adjusted the “keycloak.conf” so that it communicates with the external DB server.

Afterwards I can also call up the WEB page and I also see the link to the admin there. But I can’t get any further and unfortunately I don’t know why. It says all the time that the page is loading and the circle is turning. But unfortunately nothing more happens. Does anyone have any ideas? What else can I do? Are there any tips or tricks? ODer is the SSL encryption already required by the ADMIN?

Thank you very much for your help…