JVB node can not connect to main jitsi serve

HI,
I installed jitsi serve and JVB from this https://github.com/jitsi/jitsi-meet/wiki/jitsi-meet-load-balancing-installation-Ubuntu-18.04-with-MUC-and-JID
but seems like the JVB node can not connect to the main server, on stop of the first videobridge all conference stops… never starts again…
Can anyone help please
TIA