Mattermost, Inc.

Wiko with Android 7.0 "Cannot connect to the server"

I’m trying to connect to my server with an Android phone and I’m running into this error:

Cannot connect to the server. Please check your server URL and internet connection.

I’ve followed the instructions for Troubleshooting Mobile Applications in the docs, but couldn’t fix it yet.

Some details:

  • The app can connect to as expected
  • The device that cannot connect is a Wiko Harry with Android 7.0
  • Other Android devices (Samsung Galaxy J3 with Android 5.1.1) can log in as expected, therefore the server seems to have SSL set up fine (with Let’s Encrypt)
  • No errors in the system logs (logging level ERROR)

How can I debug this further?
Thank you!