Could Not Connect my react app via ip4 address

Question

This is my first time making react project.

After I run my project with npm run start, I can connect to it via localhost:3000 and 127.0.0.1:3000 without any problem.

But when I try to connect it with my LAN address on the same computer it shows

Could Not Connect Description: Could not connect to the requested server host.

It also shown an error on browser console.

Failed to load resource: the server responded with a status of 502 (internal error - server connection terminated)

This same project can be open via ip4 if I run it on my laptop. I can even open it from my mobile in the same wifi.

My computer is own by company so I think something might block it.

Please give me your suggestions on how to fix this problem. What could possibly cause this problem.

Any insight would be helpful.

Thank you.

Answer 1

Run HOST=0.0.0.0 npm run start

Check your IP. <your-ip>:3000 would work.

https://create-react-app.dev/docs/advanced-configuration/ for setting HOST environment variables.