It could be for many reasons, for example: you don't have enabled the ip_forward in the server, you cluster have a network policy, your DNS is not resolving the service ip and so on. Try testing the cluster iyou directly with nmap and traceroute. For DNS you can test with this command: dig @server_ip fqdn_service_name.
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It could be for many reasons, for example: you don't have enabled the ip_forward in the server, you cluster have a network policy, your DNS is not resolving the service ip and so on. Try testing the cluster iyou directly with nmap and traceroute. For DNS you can test with this command: dig @server_ip fqdn_service_name.