I am working on a react-native project and I run it on emulator android(AVD manager)

i have run adb reverse tcp:8081 tcp:8081 at cmd , but still my emulator stuck Whenever i am changing my project and reload emulator!

Development Operating System:Windows 10

React Native version: 0.55.4enter image description here

  • What is running at, and can the Android (Emulator) properly route packets to that address? – Matt Clark Jul 31 '18 at 22:28
  • i don't know what is running at!!, when i am running react-native run-android ,it build successful – Mahdavi Aug 1 '18 at 8:37

The latest version of React Native change the port of emulator by somehow but the older not. Anyway, please reference to this link . Then it will help you sort it out.


  • i don't find Debug Server port & port for device at android emulator (AVD) – Mahdavi Aug 1 '18 at 8:26
  • In emulator, press Ctrl+M to open Developer menu. – nahoang Aug 1 '18 at 9:46
  • i had done it but no action was taken – Mahdavi Aug 1 '18 at 14:01

Maybe your 8081 port is already in use.

Try the first solution in here https://facebook.github.io/react-native/docs/troubleshooting

$ sudo lsof -i :8081

$ kill -9

After that,

$ cd YourProject


$ npm start

this should help you debugging the packager


Your issue can also relate to watchman, try the following commands (I used them on linux ubuntu)

   echo 256 | sudo tee -a /proc/sys/fs/inotify/max_user_instances
   echo 32768 | sudo tee -a /proc/sys/fs/inotify/max_queued_events
   echo 65536 | sudo tee -a /proc/sys/fs/inotify/max_user_watches

the above commands worked for me


I had the same issue. I fixed it by reinstalling the watchman package. If you are using mac do this brew uninstall watchman and then brew install watchman

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