Hangfire Start Requesting Loopback address

I have two servers server1 and server2 siting behind load balancer. Both the server running a Asp.net core same instance service which starts hangfire. For most of the time hangfire starts Requesting as
“Request starting POST http://Loadbalancer/Service/v1/aus/batch/150/run application/json; charset=utf-8 4”
and after sometime start Requesting “Request starting POST 0”.
At that time it just stuck there until app pool get restarted or externally trigger hangfire

Please let me know if you have further question.