Expo network response timeout? Port issue

Question

I am getting error on my expo go app.

Error :

Uncaught error:java.net.SocketTimeout Exception: failed to connect to /192.168.100.10(port 19000) from / 192.168.100.2(port 39440) after 10000ms.

Answer 1

Connecting Expo Go from device (android) and my react-native app (windows 10):

Some reasons I found:

1. Different internet network
2. IP address wrong (one possible reason: virtual machines)
3. Firewall

Some facts:

1. About change LAN connection to TUNNEL in Metro UI:

• Metro bundler user interface is not displayed in browser (only a json) because it was released after [email protected]
• Change type connection is not recommended. It is slower.
• settings.json file in .expo folder has "hostType": "lan" attribute but it has not be changed manually. There is the documentation about "to enable tunneling" (when it is really necessary) https://docs.expo.dev/workflow/expo-cli/?redirected

2. You could set your IP address as an enviroment variable and run npm start. CyrisXD explains here https://github.com/expo/create-react-native-app/issues/144

My solution:

• Windows settings / To allow app (Node.js Javascript Runtime) to communicate through Windows firewall1 / Advanced security / Entry rules2.

• Spanish: Configuración de Windows / Permitir a las aplicaciones comunicarse a través de Firewall de Windows Defender1 / Cambiar configuración / Reglas de entrada2.