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  1. Qt
  2. QTBUG-74109

Network module fails to switch to cellular link after Wi-Fi has been disabled



    • Bug
    • Resolution: Duplicate
    • Not Evaluated
    • None
    • 5.11
    • None
    • iOS/tvOS/watchOS


      If an application that uses QNetworkAccessManager loses Internet access through its Wi-Fi connection, then it fails to use the cellular link to access Internet.

      Steps to reproduce:

      1. Build attached minimal project
      2. Make sure you have Wi-Fi connected to Internet AND cellular activated
      3. Start app > click "ping" > you should see something downloaded
      4. Disable Wi-Fi from the device settings
        1. Variant: switch to another Wi-Fi with no Internet access
      5. Return to app > click "ping" > cannot access Internet despite cellular connection

      Note: if you can't reproduce this issue, try to enable/disable the Wi-Fi a few times and retry. Restarting the device seems to momentarily fix the issue.

      Note 2: if you start the app with Wi-Fi disabled, it can access Internet with cellular.

      Android seems not affected by this.

      Related issues:

      The above-mentioned issues relate to the QNAM not restoring Internet access after Wi-Fi was disabled and then re-enabled. My issue is different: it's Qt not switching to cellular when there is no more Internet access through Wi-Fi.


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              tpochep Timur Pocheptsov
              julien-l Julien Lemaitre
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