▷ How to fix an unknown error in Avast when updating

Avast is one of the best free antivirus options for users who don't want to spend money but want the best quality protection they can get.. It is popular and works very well, but there are some bugs that have been worrying users for a while, like avast update “Unknown error”.

Avast update “Unknown error”

We have prepared several working methods for this problem, so be sure to review and test them one by one before giving up. The error appears when trying to update the virus definitions or the tools themselves.

What Causes the Unknown Avast Update Error?

The problem is usually caused by DNS settings that need to be changed. It is very possible that the DNS address that was acquired automatically is not good enough and we suggest that you change it to one from Google.

It may also be that the firewall is blocking the updater's connection to the Internet, so be sure to allow it, regardless of the antivirus you are using. Resetting Internet Explorer Settings May Work For You Too!!

Solution 1: change the DNS you are using to Google's

DNS settings are one of the most important Internet connection settings that you can modify in relation to your network connection. DNS address is obtained automatically by default, but you can always enter the address you want to use.

We recommend that you use Google's DNS address, which is available for free to use and which has helped many users to solve the Avast update “Unknown error”.

1. Use the Windows key combination + R which should immediately open the Run dialog where you need to type $ 0027ncpa.cpl $ 0027 in the bar and press OK to open the Internet connection configuration item in the Control Panel.

2. The same process can also be done through the manual Control Panel. Change the view by setting the category in the upper right part of the window and clicking Network and Internet in the upper part of the window. Click the button in the Network and Sharing center to open it. Try to find the Change adapter settings button in the left menu and click on it.

Running the network settings on the control panel

1. Now that the Internet Connection window is open following the instructions explained above, double click on your active Network Adapter and click the Properties button below if you have administrator permissions.

2. Find the list item Internet Protocol version 4 (TCP / IPv4). Tap it to select it and click the Properties button below.

Change DNS address

1. Stay on the General tab and change the radio button in the Properties window to “Use the following DNS server addresses” if it was set to something else.

2. Set the preferred DNS server to 8.8.8.8 and the alternate DNS server at 8.8.4.4 to be able to use Google's DNS address.

3. Keep the option checked “Validate configuration on exit” and click OK to apply the changes immediately. Check if the Avast update still appears “Unknown error”.

Solution 2: reset Internet Explorer settings

You may think that this method probably does not apply to you, but it does, regardless of whether you are using Internet Explorer or not. Internet Explorer settings are related to all proxy settings, DNS and connection that need to be reset to prevent the “unknown error” Avast update reappears on your computer.

1. Open Internet Explorer on your computer by searching for it on the desktop among the shortcuts or in the Start menu by linking its name. Click on the Team icon in the upper right corner. In the menu that opens, click Internet Options to open a list of related connection settings.

Internet Options in Internet Explorer

1. If for some reason you do not have access to Internet Explorer, open the Control Panel by searching for it in the Start menu or using the Windows key combination + R, writing & amp; quot; control.exe & amp; quot; on the taskbar and click OK to run the Control Panel.

2. In the control panel, select View as: Category in the upper right corner and click the Network and Internet button to open this section. Inside the new window, click Internet options to navigate to the same screen as if you had opened Internet Explorer.

Internet Options in Control Panel

1. Navigate to the Advanced tab and click Reset in the Reset Internet Explorer Settings section.

2. Check the box next to Delete personal settings if you are not concerned about files left by Internet Explorer. It is recommended to check this box only if you are not using Internet Explorer at all.

3. Make sure to click the reset button again and wait for the process to finish completely. Check if the error still appears when updating Avast.

Solution 3: add firewall exception for updater

Avast Updater has its own executable and it is recommended to allow it in your firewall. If you are using a third party firewall, you can follow the necessary steps to add a program through it. They must be available on your website. Then, We show you how to do the same with Windows Defender:

1. Launch the Control Panel by searching for this tool in the Start button or by clicking the Search button or the circular Cortana button on the left side of the taskbar.

2. After Control Panel opens, change your view to large or small icons and navigate to the bottom to locate the Windows Defender Firewall option.

Windows Defender Firewall in Control Panel

1. Click Windows Defender Firewall and click the Allow option and the app or feature through Windows Firewall in the list of options on the left. A list of installed applications will open. Navigate to where you installed Avast & gt; & gt; setting & gt; & gt; instup.exe. Choose this executable file.

2. Click OK and restart your computer before trying the update process again to see if the Avast update & amp; quot; Unknown error & amp; quot; Still appears!

Solution 4: perform a clean install of Avast

There is almost no problem that cannot be solved with a clean and simple installation that removes all files, registry entries and any rest with a special utility created by Avast especially for such purposes. This method is very useful and you should definitely use it as a last resort when you get this error.

1. Download the latest version of the Avast installation package by clicking and opening this link and clicking the Download Free Antivirus button in the center of the website.

2. What's more, you will need to download the Avast Uninstall Utility from this link, as you will need it immediately to get rid of leftover files.

3. Disconnect from the Internet after you have downloaded these files and start in Safe Mode by following the instructions we have prepared in this article. This step is not necessary, but it will provide better results.

4. Run the Avast Uninstall utility and find the folder where you installed Avast. If you installed it in the default folder (Program files), can leave it. Navigate the File Explorer until you find the correct folder. Avast Uninstall Utility

5. Click on the Delete option and restart the computer by starting the normal startup. Check if the update is back to normal.

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