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Steps to reproduce the issue:

Full output of failed command:

=> grpc server is running on pods and created a database connection.

Error

Connection to server failed: rpc error: code = Unavailable desc = connection error: desc = "transport: Error while dialing dial tcp 192.168.5.173:9090: connect: connection refused

Note:- error comes when I try to run a client from localhost to connect to grpc running server as Kubernetes service.

Full output of minikube start command used, if not already included:

minikube service is running properly only unable to access using go grpc client from local system

Optional: Full output of minikube logs command:

grpc server command running on minikube:-
go run cmd/server/main.go -grpc-port=9090 -db-host=127.0.0.1:3306 -db-user=$USER -db-password=$password -db-schema=$database

grpc client to access server running on minikube:-
go run cmd/client-grpc/main.go -server=$(minikube ip):9090

In my case the server host variable defaulted to localhost.
Setting the server to listen on 0.0.0.0 fixed the issue. (listen / allow for any ip)

when i checked netstat, the server was set up to listen on 0.0.0.0.

I am using kind, but had the same problem. localhost was the culprit.

This fixed it for me.

net.Listen("tcp", ":9090")
          
Making the GRPC server listen to 0.0.0.0 instead of localhost fixed the 'Connection Refused' error in my case. This issue happened only when I created the server inside a kubernetes pod.
'localhost' works fine when running the server directly on the host machine.