failed to listen: listen tcp :50051: bind: address already in use exit status 1

[CIFER.AI]

What version of gRPC are you using?

1.62.1

What version of Go are you using (go version)?

go1.20 darwin/arm64

What operating system (Linux, Windows, …) and version?

macOS Ventura 13.1

What did you do?

I follow the instruction in https://grpc.io/docs/languages/go/quickstart/
I compile and execute the server using command
$ go run greeter_server/main.go

What did you expect to see?

I expect to see it complied and executed successfully.

What did you see instead?

I got this error:
failed to listen: listen tcp :50051: bind: address already in use
exit status 1

As I check my local port, there is nothing run on port 50051

I also try grpc-python and grpc-node and they show the similar error - address already in use.

In this case, please provide troubleshoot instruction to fix this error.

[Zach Reyes]

This looks like the local port is already in use. What is the command you are running to check?

[CIFER.AI]

First I use:
$ netstat
Then find for 50051 and it's not found.

Then I try:
$ lsof -i :50051
And it shows no result.

Then I try:
$ sudo lsof -i :50051
Now it shows that port is used, but after I try to kill this port with $ kill -9 $(lsof -ti:50051) it can't kill.

So I change to port 50052 in source code and now it works.

Thank you for your advice.

[Zach Reyes]

Ah, ok, makes sense. Glad you were able to figure it out!