Troubleshooting

This section lists problems that you might encounter while working with the Qt emulator.

Firewall Warning Message on Windows

On Windows, you may see a firewall warning message after starting the emulator for the first time. The warning message says that some emulator features are blocked on local and remote networks. User is asked to allow or cancel the connections.

You need to update the firewall settings:

  1. Select Firewall Settings for your network.
  2. Select Advanced settings.
  3. Select Inbound rules.
  4. Remove all entries of emulator.exe.
  5. Start the emulator.
  6. When the firewall warning message appears, allow all connections.

Connection to Internet Fails

By default, the VirtualBox is configured to use a host-only network, so external connections do not work in the emulator.

You may be able to enable Internet connectivity with another virtual network adapter in NAT mode by adapting these instructions.

Error message: Nonexistent host networking interface, name 'vboxnet0'

You may see the following error message when the emulator does not start properly:

Error: failed to start machine. Error message: Nonexistent host networking interface, name 'vboxnet0' (VERR_INTERNAL_ERROR)(CC)"

See the solution proposals in https://www.virtualbox.org/ticket/7067.

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