But I do agree that there should be a function that completely blocks it if that is the case. A regular user could do this as way to shut down the server.
I agree.
But it's a very serious bug and it should be fixed ASAP.
Apache did not give any useful info on Debian 10 with command systemctl status httpd.service
Nginx gave this with systemctl status nginx.service:
nginx: [emerg] SSL_CTX_use_certificate("/usr/local/directadmin/data/users/x/domains/x.com.cert.combined") failed (SSL: error:140AB18E:SSL routines:SSL_CTX_use_certificate:ca md too weak)
If you need to figure out how to do something or have other questions this forum is fine. But if there is a legitimate bug then that should be reported to them directly through the ticket system https://tickets.directadmin.com/ They don't read every single post here.