You can prevent DNS leaks by disabling the 'smart multi-homed name resolution' policy setting on Windows 10 or Windows 8.1 / 8. This setting is enabled by default and is intended to optimize DNS queries and improve performance. However, when enabled, it also leaves you vulnerable to DNS hijacking and DNS leaks. These leaks can result in web activity monitoring, even when you are using a VPN.
DNS leak prevention in AVG Secure VPN does not apply to Windows 7, Windows Vista, or Windows XP systems. If you are experiencing DNS leaks on these operating systems, we recommended upgrading to a more recent version of Windows.
Instructions
To disable the 'smart multi-homed name resolution' service, refer to the relevant instructions below.
- Click the Windows
Start button, start typing gpedit.mscto open the search field, and select gpedit.msc from the search results. - In the Local Group Policy Editor, double-click Computer Configuration in the left panel.
- Double-click Administrative Templates and Network to expand these sections, then click DNS Client.
- In DNS Client, double-click Turn off smart multi-homed name resolution.
- Select Enabled to turn off the service, then click Apply to confirm.
- Click OK to return to the Local Group Policy Editor.
Start button, start typing 
The smart multi-homed name resolution service is now disabled.
- Hover your cursor over the Menu (minus sign) in the bottom-right corner of your screen to open the Windows menu options.
- Click Search.
- Type
gpedit.mscinto the search field, then select gpedit.msc from the search results. - In the Local Group Policy Editor, double-click Computer Configuration in the left panel.
- Double-click Administrative Templates and Network to expand these sections, then click DNS Client.
- In DNS Client, double-click Turn off smart multi-homed name resolution.
- Select Enabled to turn off the service, then click Apply to confirm.
- Click OK to return to the Local Group Policy Editor.
The smart multi-homed name resolution service is now disabled.
- AVG Secure VPN 1.x for Windows
- Microsoft Windows 10 Home / Pro / Enterprise / Education - 32 / 64-bit
- Microsoft Windows 8.1 / Pro / Enterprise - 32 / 64-bit
- Microsoft Windows 8 / Pro / Enterprise - 32 / 64-bit
- Microsoft Windows 7 Home Basic / Home Premium / Professional / Enterprise / Ultimate - Service Pack 1 with Convenient Rollup Update, 32 / 64-bit