Flutter app on iOS throws SocketException: Failed host lookup: 'google.com' (OS Error: nodename nor servname provided, or not known, errno = 8)

Question

Flutter app on iOS when on mobile data throws the following error:

SocketException: Failed host lookup: 'google.com' (OS Error: nodename nor servname provided, or not known, errno = 8)

when running the following code:

    try {
      final result = await InternetAddress.lookup('google.com',
          type: InternetAddressType.IPv4);
      if (result.isNotEmpty && result[0].rawAddress.isNotEmpty) {
        hasConnection = true;
      } else {
        hasConnection = false;
      }
    } on SocketException catch (_) {
      hasConnection = false;
    }

App on Android or iOS with WiFi works well. Tested on two real devices.

nightpool · Accepted Answer · 2022-12-21 17:48:01Z

0

The problem was on the parameter type: InternetAddressType.IPv4. This requires that the returned address is only of type IPv4, which may not be the case for devices that are connected to the internet using IPv6. Using the default parameter (type: InternetAddressType.any) solves the problem

edited Dec 21, 2022 at 17:48

nightpool

6108 silver badges18 bronze badges

answered Dec 16, 2022 at 14:25

Camillo Rinaldi

316 bronze badges

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