Xcode 10 runtime warning on fresh install: nw_socket_handle_socket_event

[mog3n]

Description

While running the boilerplate react native app, I receive the runtime error:
2018-09-09 21:46:07.681496-0400 client[2035:560210] [] nw_socket_handle_socket_event [C6.2:1] Socket SO_ERROR [61: Connection refused] 2018-09-09 21:46:07.681861-0400 client[2035:560216] [] nw_connection_get_connected_socket [C6] Client called nw_connection_get_connected_socket on unconnected nw_connection 2018-09-09 21:46:07.681903-0400 client[2035:560216] TCP Conn 0x2821ac300 Failed : error 0:61 [61]
which loops over and over for the duration of debugging the app on a device. I'm not sure exactly what this error is associated with, however in my other app I receive the same error. This may or may not be related to remote push notifications (APNs).

Environment

React Native Environment Info: System: OS: macOS 10.14 CPU: x64 Intel(R) Core(TM) i7-7820HQ CPU @ 2.90GHz Memory: 27.59 MB / 16.00 GB Shell: 3.2.57 - /bin/bash Binaries: Node: 9.8.0 - /usr/local/bin/node Yarn: 1.5.1 - /usr/local/bin/yarn npm: 5.6.0 - /usr/local/bin/npm Watchman: 4.9.0 - /usr/local/bin/watchman SDKs: iOS SDK: Platforms: iOS 11.4, macOS 10.13, tvOS 11.4, watchOS 4.3 IDEs: Xcode: 9.4.1/9F2000 - /usr/bin/xcodebuild npmPackages: react: 16.4.1 => 16.4.1 react-native: 0.56.0 => 0.56.0 npmGlobalPackages: create-react-native-app: 1.0.0 react-native-cli: 2.0.1

Reproducible Demo

1. react-native init
2. react-native run-ios
3. In Capabilities, enable both 'Notifications' and Background Modes -> Enable 'Remote notifications'
4. Open Xcode and select a connected iPhone
5. Launch/debug the app and open the Xcode console

A couple of notes:

• Device is iPhone X on iOS 12.0 beta (16A5366a)
• Building the app using Xcode 10.0 beta 2 (10L177m) beta, while react-native run-ios builds using Xcode 9.4.1
• macOS is running 10.14 Beta (18A377a)

[mog3n]

UPDATE This only happens when I run it on an iOS 12 device!!! (Doesn't matter what I build with) Reverting back to iOS 11 for now.

[yacut]

same issue with 0.57.0 version:

react-native info
  React Native Environment Info:
    System:
      OS: macOS High Sierra 10.13.6
      CPU: x64 Intel(R) Core(TM) i7-7820HQ CPU @ 2.90GHz
      Memory: 690.77 MB / 16.00 GB
      Shell: 5.3 - /bin/zsh
    Binaries:
      Node: 8.11.4 - /usr/local/bin/node
      Yarn: 1.9.4 - /usr/local/bin/yarn
      npm: 5.6.0 - /usr/local/bin/npm
      Watchman: 4.9.0 - /usr/local/bin/watchman
    SDKs:
      iOS SDK:
        Platforms: iOS 12.0, macOS 10.14, tvOS 12.0, watchOS 5.0
    IDEs:
      Android Studio: 3.1 AI-173.4907809
      Xcode: 10.0/10A255 - /usr/bin/xcodebuild
    npmPackages:
      @types/react-native: ^0.56.21 => 0.56.21 
      react: 16.5.1 => 16.5.1 
      react-native: ^0.57.0 => 0.57.0 

[nebulashine]

Is this resolved? I'm also seeing messages like:
2018-09-18 15:25:36.721046-0700 AwesomeProject[18908:21074308] [] nw_socket_handle_socket_event [C4.1:1] Socket SO_ERROR [61: Connection refused]
2018-09-18 15:25:36.728264-0700 AwesomeProject[18908:21074308] [] nw_socket_handle_socket_event [C4.2:1] Socket SO_ERROR [61: Connection refused]
2018-09-18 15:25:36.734951-0700 AwesomeProject[18908:21074298] [] nw_connection_get_connected_socket [C4] Client called nw_connection_get_connected_socket on unconnected nw_connection

[BANG88]

Temporary fix:

Edit Scheme => Run => Environment Variables => Add OS_ACTIVITY_MODE:disable

[fulvio-m]

Temporary fix:

Edit Scheme => Run => Environment Variables => Add OS_ACTIVITY_MODE:disable

This works fine, but keep in mind that it also suppresses all NSLog output you may need for debugging.

[Jackyaung]

I also have the same problem, it keeps running and the memory is getting big and big, when it reached 15G, my computer crushed

[jnicholls]

Any info on this? I am too seeing a spew of these errors in debug output when running my app on a device. I haven't tracked memory consumption on the device yet but I will do that soon to see if this is a show-stopping issue that would prevent me from releasing my app.

EDIT: While I haven't seen me any absurd memory growth, it is chewing through an abnormal amount of CPU while in this cycle of establishing connections.

[anthonywebb]

Still broke :(

[divsbhalala]

I also having same issue with xcode 10 and IOS12

[vemundeldegard]

Same issue on Xcode 10 and IOS12.

[weitieda]

Same issue on Xcode 10 and IOS12.