You should specify port, if this hits one of your frontend services then the frontend grpc port, if its hitting load balancer, then its port you have assigned to take all the client requests.
vzpvnsp@10-118-227-185.ebiz.verizon.com-/apps/opt/application/Temporal/bin $ ./tctl --ad vnspdev07.ebiz.verizon.com:13981 cluster health
Error: Unable to get "temporal.api.workflowservice.v1.WorkflowService" health check status.
Error Details: rpc error: code = Unavailable desc = connection closed before server preface received
('export TEMPORAL_CLI_SHOW_STACKS=1' to see stack traces)
Same error and getting 503 while trying to load the page
Same error and getting 503 while trying to load the page
Maybe take a look at your load balancing configuration (i assume vnspdev07.ebiz.verizon.com points to LB?). If you give details of what vnspdev07.ebiz.verizon.com is that would help too. It’s hard to tell what’s going on as it seems its related to your server setup so any additional info you can give would help.