if you are following the normal jitsi setup without docker then follow this on jibri server
Update /etc/hosts file
/etc/hosts file with hostname as jvb
update /etc/jitsi/jibri/config.json file
/etc/jitsi/jibri/config.json uipdate this file with ipaddres or domain name of JVB
xmpp connects with the jvb from jibri.
reboot the server to apply /etc/hosts file