Starting a meeting I get NGINX Welcome message instead of launching the meeting

I installed 2 days ago jitsi meet server on a local Linux 20.04 and it worked fine.
After some network problems I can’t even run the jitsi host on the same PC.
When setting in the browser of the Linux the local URL with the internal IP address I get the message from NGINX that it runs fine and no feedback from the Jitsi.
Any idea what to check?
I. Lesher

When accessing the Jibri server you must use the FQDN set during setup