DevApp not finding from Android, but iOS ok

I’ve got DevApp installed on an iOS and an Android device. We’re all on the same WiFi. The iOS one finds my app just fine, while on Android it is still just Listening. Any suggestions for how to trouble shoot this? I can ping the Android device - I did try that.

ionic info:

cli packages: (/usr/local/lib/node_modules)

    @ionic/cli-utils  : 1.19.0
    ionic (Ionic CLI) : 3.19.0

global packages:
    cordova (Cordova CLI) : 7.1.0

local packages:
    @ionic/app-scripts : 3.1.5
    Cordova Platforms  : browser 5.0.1
    Ionic Framework    : ionic-angular 3.9.2

    Android SDK Tools : 26.0.2
    Node              : v7.10.0
    npm               : 5.6.0
    OS                : macOS High Sierra
    Xcode             : Xcode 9.2 Build version 9C40b

Environment Variables:
    ANDROID_HOME : /usr/local/Caskroom/android-sdk/3859397

    backend : pro