Sometimes Avast Antivirus may be blocking you from running a program or accessing web page, which you know is totally safe. Usually it’s because of the low application occurrence within the Avast community. Therefore, Avast can’t properly tell if the program is safe or not, and will try to protect you.

Also, Avast detects so-called ‘Potentially Unwanted Programs‘, which are actually wanted in some cases, and so-called ‘False-Positives‘, which means the program is safe but Avast’s detection is wrong. Unfortunately this often happens with popular games and services like League of Legends (LoL), Steam, GoG Galaxy, MinecraftuTorrentBitTorrent, Windows Update, Google, Java, Chrome and other launchers which are being often updated. Usually the false-positive detection lasts only a few hours, but can be very annoying.

When Avast blocks something, you will always get a pop-up notification informing you about the threat.

Avast 2017 Web Shield Has Blocked a Threat Pop-up

Avast 2017 Web Shield Has Blocked a Threat Pop-up

Solution/Fix for the Invalid Certificate Issue Caused by the HTTPS Scan

Recently lot of Avast users (especially the ones running Windows XP) are experienced an issue when Avast has been blocking several major websites because of the invalid cloudflaressl.com certificate. The full message on the pop-up is ‘Avast Web Shield has blocked access to this page because the following certificate is invalid: [name of the certificate]‘.

To fix this try one of the following actions:

Disabling HTTPS Scanning in Avast 2017 Web Shield Settings

Disabling HTTPS Scanning in Avast 2017 Web Shield Settings

Solution/Fix When Avast is Blocking Internet Connection Completely

Sometimes Avast may even block completely the Internet access so user is not able to visit any website. If this happens to you, try one of the following actions:

  • Update your Avast to latest version available
  • Repair your Avast installation by going to Programs » Uninstall a program » Avast » select Repair and restart your computer
  • Disable HTTPS scanning by going to settings » Active Protection » Web Shield » Customize » Main settings » Un-check ‘Enable HTTPS scanning‘ and restart your computer

Solution/Fix When Avast is Blocking Specific Website, Program or Game

There are two ways to unblock any program or website from Avast blocking. Please note, you should do it only if you are 100% sure the blocked file is safe for you and your computer. Even if you own the blocked site, doesn’t mean it wasn’t hacked and injected with dangerous malware. For checking the program/file with other Antivirus vendors, you can use online detection at VirusTotal.

1. Add Blocked Program or Website to Exclusion List (Whitelist) to Unblock it

Using the exceptions in Avast you can simply add any file or URL to the list of exclusions and exclude it from scanning and shield protection, therefore also from blocking. For more information about adding exceptions, check our full guide ‘How to Add File/Website Exception into Avast Antivirus 2017‘.

Adding File/Folder/Program/Website URL Exception into Avast 2017

Adding File/Folder/Program/Website URL Exception into Avast 2017

2. Temporarily Turn Off Avast Protection

If you want install or run a program but it’s being blocked by Avast you can simply turn off Avast shields for a short period of time. For more information about turning off Avast or it’s shields, check our full guide ‘How to Turn Off (Pause, Disable) Shields in Avast Antivirus 2017‘.

Temporarily Disabling Avast Protection from the Windows Tray

Temporarily Disabling Avast Protection from the Windows Tray

3. Report a False Positive Detection to Avast

We also strongly suggest to report the detection you believe is a false positive directly to Avast team. They will look into it and eventually confirm the reported file, software, or website is clean.

Link to report is included on every in-product pop-up displayed when the harmful webpage or file is blocked. Just click on ‘Report the file as a false positive‘.

Avast Web Shield Has Blocked a Harmful Webpage or File Pop-up

Avast Web Shield Has Blocked a Harmful Webpage or File Pop-up

Then you need to fill-in following simple form. In the additional info you can add a link from VirusTotal scan. Don’t forget to check the option ‘I know what I’m doing‘ and click on ‘Submit‘.

Avast In-product Form for Reporting False Positive Detection of Files or Websites

Avast In-product Form for Reporting False Positive Detection of Files or Websites

Alternatively you can use the official web form for reporting false positive detection.

Official Avast Web Form for Reporting False Positive Detection of Files or Websites

Official Avast Web Form for Reporting False Positive Detection of Files or Websites

Additional Notes

Although we have used Avast Free Antivirus 2017 screenshots in this article, these steps are also applicable for all Avast Antivirus solutions (i.e. also for Avast Pro Antivirus, Avast Internet Security, or Avast Premier) running the latest version available.

Steps are relevant for all Windows versions – Windows XP, Windows Vista, Windows 7, Windows 8, Windows 8.1 and Windows 10 (including Anniversary Update).

Managing exceptions or turning off Avast protection may leave your computer at risk.

Written by Paul B.

My name is Paul and I love Avast since the Home Edition v4.8 (2008). I am recommending it to all my friends, but I realized they don't know how to use it. So I started this site in order to help others getting maximum from this awesome antivirus. Feel free to contact me via Facebook, comments below or this form.

This article has 61 comments | Did we miss anything? Just let us know in the comments!

  1. Mike Reply

    That doesn’t work. Avast only just updated it’s software and now all Gmail and other Google services are blocked and only turning off shields makes them work. I’m looking for a new AV as I’ve had it with Avast. If it’s not one problem it’s another.

  2. eric le roy Reply

    I live in Moscow. I have been receiving NONSTOP pop-up advertising from this infernal company. You claim to be anti-viral but you are nothing but a goddamned virus yourselves. Will you cocksuckers PLEASE remove this infestation from my screen ???

  3. ken Reply

    damn avast. it blocks you from installing any other brand of anti virus – even if you uninstall it. but it lets you put avast back. it did something to my computer! i am terminally ill, and sick. i do not need this. avast makes computer freezing pop ups to advertise itself. i want this stopped and will not pay them!!!!!!!!!!!!!!!!!!!!!!!!!!

  4. JAG. Reply

    I NEED HELP I’M NOT COMPUTER SAVVY AND MY FIREWALL IS BLKING MY GAME SITE STEAM . I CANT GET IN TO PLAY MY GAMES THIS IS A MAJOR PROBLEM FOR ME SOMEONE PLEASE HELP

    JAG.

  5. Ben Miller ARS w4qed Reply

    I’ve used the C:\Windows\,C:\Programs\ and C:\Programs (x86) exclusions and the http:192.168.1.105 and still having problems.

    Using the cmd in a batch file:

    curl http://username:passowrd@192.168.1.105:25105/3?0263DC00=I=3

    username:password not actual. and getting the following error:

    curl: (56) Recv failure: Connection was reset

    This started after an upgrade of Avast. Any ideas?

  6. Simonq Reply

    My solution: I uninstalled AVAST. What a bleeping nightmare. For two hours tried to open with right click so I could turn shields off for 10 minutes. It wouldn’t open. I disabled with task master and then uninstalled. Done with Avast even though I sent them $30 bucks (or whatever) last month.

  7. Anne Reply

    About a week ago paint shop pro9 wouldn’t open on Win 7 pro. Been troubleshooting for days on end by uninstalling, reinstalling countless times. Checking the event viewer I found problem signature. Scouring the internet for any kernel of info, I landed on a site today that mentioned spybot interfering with programs. So I uninstalled spybot, tried to run program. No go. I uninstalled Avast. And wallah the program opened. Reinstalled Avast and made sure I excluded Jasc Paint Shop Pro for Avast’s tentacles. Which I’m sure is much needed, but if I can’t work with my program, then I’ll have to turn off the internet of find another solution. Possibly you could tell me what I should do. Thank you.

  8. M. Narunsky Reply

    When Avast blocked my access to The Jerusalem Post, and I spent almost a whole day trying to solve the problem – to no avail – I simply uninstalled Avast and downloaded and installed another brand of free antivirus software, and I haven’t had a problem since.

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