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Connection refused when running android project

See original GitHub issue

Environment

OS: Windows 7 Node: 8.11.1 Yarn: Not Found npm: 5.6.0 Watchman: Not Found Xcode: N/A Android Studio: Not Found

Packages: (wanted => installed) react: 16.3.1 => 16.3.1 react-native: 0.55.4 => 0.55.4

Description

Connection refused while running react-native run-android

Steps to Reproduce

react-native run-android

Expected Behavior

Build success

Actual Behavior

[DeviceMonitor]: Unable to open connection to: localhost/xx.xxx.xxx.xx:5037, due to: java.net.ConnectException: Connection refused: connect [DeviceMonitor]: Connection attempts: 1 [DeviceMonitor]: Unable to open connection to: localhost/xx.xxx.xxx.xx:5037, due to: java.net.ConnectException: Connection refused: connect [DeviceMonitor]: Connection attempts: 2

Issue Analytics

State:
Created 5 years ago
Comments:8

Top GitHub Comments

8reactions

minhphung210commented, Dec 25, 2018

It’s due to fact that Win7 prefers to return IPV6 address for localhost and mine was not properly setup. So I forced java to use IPV4 adress by adding a new environment variable : _JAVA_OPTIONS=-Djava.net.preferIPv4Stack=true And it fixed it.

in what file?

cd your project file and paste it to terminal for mac: export _JAVA_OPTIONS=-Djava.net.preferIPv4Stack=true

3reactions

vbraekecommented, Jun 12, 2018

It’s due to fact that Win7 prefers to return IPV6 address for localhost and mine was not properly setup. So I forced java to use IPV4 adress by adding a new environment variable :

_JAVA_OPTIONS=-Djava.net.preferIPv4Stack=true

And it fixed it.