Changing your DNS settings to troubleshoot issues with Avast products

Problems with the DNS servers from your internet service provider can compromise the functionality of certain Avast products on Windows, Mac, and iOS. You may experience the following issues:

  • Avast SecureLine VPN:
    • Avast SecureLine VPN cannot establish an internet connection, or you cannot browse the internet while connected to Avast SecureLine VPN.
  • Other Avast products:
    • Avast does not accept your valid activation code, so you are unable to activate a paid subscription.
    • Avast installation repeatedly fails.

To troubleshoot these issues, Avast Support may request that you change your internet connection settings to use DNS servers from a different provider, such as Cisco, Google, Cloudflare, or Quad9.

Instructions

  1. Log into Windows as a user with administrator permissions.
  2. Click the Windows Start button and select Settings (the gear icon).
  3. On the Windows Settings screen, click Network & Internet.
  4. Under Change your network settings, click Change adapter options.
  5. Press the Win key and X key simultaneously, then select Control Panel from the menu that appears.
  6. Under Network and Internet, click View network status and tasks if you are using the default category view, ...or click Network and Sharing Center if you are using the large/small icons view.
  7. Select Change adapter settings from the left panel of the Network and Sharing Center window.
  8. Click the Windows Start button and select Control Panel.
  9. Under Network and Internet, click View network status and tasks if you are using the default category view, ...or click Network and Sharing Center if you are using the large/small icons view.
  10. Select Change adapter settings from the left panel of the Network and Sharing Center window.
  11. Click the Windows Start button and select Control Panel, ...or select SettingsControl Panel if you are using the classic Start menu.
  12. Under Network and Internet, click View network status and tasks if you are using the default category view, ...or double-click Network and Sharing Center if you are using the classic view.
  13. Select Manage network connections from the left panel of the Network and Sharing Center window.
  14. Click the Windows Start button and select Control Panel, ...or select SettingsControl Panel if you are using the classic Start menu.
  15. Click Network and Internet Connections and then Network Connections if you are using the category view, ...or double-click Network Connections if you are using the classic view.
  16. Based on your current connection type, right-click the relevant Ethernet or Wi-Fi adapter in the Network Connections list, then select Properties from the context menu.
  17. Based on your current connection type, right-click the Local Area Connection or Wireless Network Connection in the Network Connections list, then select Properties from the context menu.
  18. If prompted by the User Account Control dialog for permissions, click YesContinue.
  19. Select Internet Protocol Version 4 (TCP/IPv4)Internet Protocol (TCP/IP) from the list, then click the Properties button.
  20. Select the Use the following DNS server addresses option, then choose one of the public DNS providers from the table below and enter both IP adresses of the related DNS servers into the relevant boxes.
    DNS providerPreferred DNS server addressAlternate DNS server address
    Cisco OpenDNS208.67.222.222208.67.220.220
    Google Public DNS8.8.8.88.8.4.4
    Cloudflare 1.1.1.1.1.1.1.11.0.0.1
    Quad99.9.9.9149.112.112.112
    Do not change anything in the upper section related to IP address, Subnet mask and Default gateway.
  21. Click OK to save your changes.
  22. If the Windows Network Diagnostics window appears, click CancelClose to exit.
  23. Press the Win and R keys on your keyboard simultaneously to run the Windows Services console, then enter cmd into the Open field and click OK.
  24. In the Command Prompt window that appears, enter ipconfig /flushdns and press Enter on your keyboard.
  1. Log into your Mac as a user with administrator permissions.
  2. Click the Apple menu ▸ System preferences, then select Network from the pop-up menu.
  3. Select the connection you are using from the left menu, such as Ethernet or Wi-Fi, then click Advanced...
  4. Select DNS and click the + button to add a server to the list, then type the DNS server you want to add. Click OK to confirm.
  1. Tap the Settings icon on your iOS device home screen and select Wi-Fi.
  2. Select the Wi-Fi network you're connected to from the list.
  3. Tap Configure DNS to open DNS settings.
  4. Select Manual and tap the red sign next to any existing DNS servers to remove them.
  5. Tap to add a new DNS server, then tap Save to confirm.

Your DNS settings are now changed.

  • Avast Premier 19.x for Windows
  • Avast Internet Security 19.x for Windows
  • Avast Pro Antivirus 19.x for Windows
  • Avast Free Antivirus 19.x for Windows
  • Avast Cleanup Premium 19.x for Windows
  • Avast AntiTrack Premium 1.x for Windows
  • Avast Driver Updater 2.x for Windows
  • Avast Security Pro 13.x for Mac
  • Avast Security 13.x for Mac
  • Avast Cleanup Premium 2.x for Mac
  • Avast Mobile Security Pro 1.x for iOS
  • Avast Mobile Security 1.x for iOS
  • Avast SecureLine VPN 5.x for Windows
  • Avast SecureLine VPN 3.x for Mac
  • Avast SecureLine VPN 5.x for iOS
  • All supported platforms

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