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If you find that Mozilla VPN is disconnecting or turning off after being activated, you can try the below steps to resolve this issue. These steps are also helpful if Mozilla VPN is connected, but websites fail to load.

Disable Firewalls (Desktop)

If you have a Firewall or Antivirus that also monitors your internet connection, it’s a good idea to disable them or allow an exception for Mozilla VPN. In order to do this, you will need to refer to your specific application's support documentation.

For Windows Defender Firewall

In the Windows Start Menu search bar, type Allow an app through Windows Firewall and click the first result.
Click the Change Settings button at the top right of the window to make changes.
The Allow another app button should highlight. Click the Allow another app button close to the bottom of the window.
Click Browse.
Navigate to the VPN by going through the following path: This PC > Windows (C:) > Program Files > Mozilla > Mozilla VPN > MozillaVPN.exe
Click Add.
Back on the Allowed apps window, make sure mozillavpn has both the Private and Public boxes next to it checked.
Click OK at the bottom.
Restart the system.

For macOS Application Firewall

Open System Preference.
Click the Security or Security & Privacy icon.
Select the Firewall tab.
Click the lock icon in the preference pane, then enter an administrator name and password.
Click the Firewall Options button.
Click the Add Application (+) button.
Select Mozilla VPN.
Click Add.
Click OK.

Reset Mozilla VPN

If none of the above solutions work and Mozilla VPN keeps disconnecting, you can try resetting Mozilla VPN:

Open the Mozilla VPN application.
Click the Settings icon.
Select Help.
Go to the Reset VPN section of the menu.
Select the Reset VPN button.
Confirm the reset by selecting the Reset and quit button.
A loading screen will appear while clearing all settings and preferences.
You will be signed out of your Mozilla VPN app and redirected to the sign in screen.