Hi @Deepaklal_KB,
Welcome to the community! It might be an issue with the signed certificate or configuration. I would recommend having a look at these issues and see if the fixes work for you:
- Kibana throws error “unable to get issuer certificate” while connecting to ElasticSearch
- Kibana server is not ready yet, error : Unable to get issuer certificate - #2 by Yang_Wang
If those don't help, can you share your Kibana configuration and let us know how you are running Elasticsearch with the LB (Elastic Cloud Enterprise or ECK operator for example).