We have 3 user application servers behind a Loadbalancer.

It works fine when tomcat on anyone to server of is started behind loadbalancer.

But when we starts all the 3 servers behind loadbalancer. It gives an error, "Authentication token is invalid".

Before it was working fine when it was running on port 8443 and when all the 3 user application servers are UP.
Recently it was changed to port 443.

And also now load balancer is running on different IP address, as previous load balancer IP did not support port 443.

I have even imported certificate from the load balancer to osp.jks file.

Please let me know how to find the root cause, if the issue it at the user application server end or at the load balancer end.