Applies to Avast SecureLine VPN for Windows, Avast Premium Security for Windows, Avast Free Antivirus for Windows
Domain Name System (DNS) leaks can sometimes still occur even when you are using Avast SecureLine VPN. You can prevent DNS leaks using one of the methods below:
Use Avast Antivirus
The latest version of Avast Antivirus actively prevents DNS leaks on IPv4 for Windows 11, Windows 10, Windows 8 / 8.1, and Windows 7 (Service Pack 1 with Convenient Rollup Update).
If you already use a version of Avast Antivirus, ensure that your application is up-to-date. For instructions, refer to the following article:
Otherwise, you can install Avast Free Antivirus. For instructions, refer to the following article:
Manage Windows settings
If you do not want to use Avast Antivirus, we recommend disabling the "smart multi-homed name resolution" setting in Microsoft Windows 8 and higher to prevent DNS leaks. This setting is intended to optimize DNS queries and improve performance. However, when enabled, it can leave you vulnerable to DNS hijacking and DNS leaks.
To disable the "smart multi-homed name resolution" setting:
- Click the Windows Start button, start typing
gpedit.mscto open the search bar, then select Edit group policy. - In the Local Group Policy Editor window under Computer Configuration, select Administrative Templates ▸ Network ▸ DNS Client.
- Double-click Turn off smart multi-homed name resolution.
- Select Enabled, then click Apply.
Start button, start typing 
Start button, start typing 
Win
The "smart multi-homed name resolution" setting is now disabled.
Updated on: 02/06/2022
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