Update: the issue has been solved postmanlabs/postman-app-support#12997

Steps to reproduce the bug

Install make and protobuf-compiler

sudo apt update
sudo apt install make
sudo apt install protobuf-compiler=3.21.12-8.2build1

Check installed version via protoc --version I've reproduced the bug with libprotoc 3.21.12 on Ubuntu 24.04. It runs WSL2 in Windows 11

The example compiles a protobuf and runs a non-TLS grpc server on port 8080 If you want to change the port you can override it via env export GRPC_PORT=<your-port>

You can build and run the server app via make command

export GRPC_PORT=8080
make

I'm using Postman v11.3.1 (Windows 11) to check the issue