When you get this for pretty much all secure sites, the problem usually is one of the following:
(1) Error in your system's date, time, or time zone, which throws off certificate validity checks. Sometimes allowing computers to use an internet-based time source can introduce this problem.
The problem is within Avast's Web Shield behavior, not every bloody https site. Ufabet I'd like to use secure scanning, but not if I have to add an exception in Avast for almost every site I go to one by one. Avast Mac Security offers three shields and on-demand scanning. Our Web Shield and Mail Shield combine to check the vast majority of incoming data from the Internet, while File Shield scans all programs stored and executed from your hard drive.
(2) Firefox not being set up to work with your security software that intercepts and filters secure connections. Products with this feature include Avast, BitDefender, Bullguard, ESET, and Kaspersky; AVG LinkScanner / SurfShield can cause this error on search sites.
If you have any of those specific security products: check this support article: How to troubleshoot security error codes on secure websites.
(3) On Windows 10, Firefox not being set up to work with the parental control software Microsoft Family Safety. (To test by turning it off, see: http://windows.microsoft.com/en-us/wi.../turn-off-microsoft-family-settings)
(4) Malware on your system intercepting secure connections.
If none of those ring a bell:
You could inspect a sample certificate to see whether that points to the culprit. If you want to try that now, here's how I suggest starting:
Load my test page at: https://jeffersonscher.com/res/jstest.php
You likely will get an error page. Expand the 'Advanced' button and look for an Add Exception button.
Note: You don't need to complete the process of adding an exception -- I suggest not adding one until we know this isn't a malware issue -- but you can use the dialog to view the information that makes Firefox suspicious.
Click Add Exception, and the certificate exception dialog should open.
Click the View button. If View is not enabled, try the Get Certificate button first.
This should pop up the Certificate Viewer. Look at the 'Issued by' section, and on the Details tab, the Certificate Hierarchy. What do you see there? I have attached a screen shot for comparison.
Sometimes Avast Antivirus may be blocking you from running a program or accessing a 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, Minecraft, uTorrent, BitTorrent, 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.
Quick Summary
- Make sure the blocked file or webpage is not malicous by testing it at www.virustotal.com
- Add it as exception by going to Avast user interface » Settings » General » Exclusions
- Confirm by clicking OK
Read more detailed steps and other options including screenshots below.
When Avast blocks something, you will always get a pop-up notification informing you about the threat.
Solution/Fix for the Invalid Certificate Issue Caused by the HTTPS Scan
Recently a 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:
- Disable HTTPS scanning by going to settings » Active Protection » Web Shield » Customize » Main settings » Un-check ‘Enable HTTPS scanning‘ and restart your computer
Disabling HTTPS Scanning in Avast 2018 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:
- 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 2018‘.
Adding File/Folder/Program/Website URL Exception into Avast 2018
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 2018‘.
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
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
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
Additional Notes
Although we have used Avast Free Antivirus 2019 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.
Web Site Or Website
Steps are relevant for all Windows versions – Windows XP, Windows Vista, Windows 7, Windows 8, Windows 8.1 and Windows 10 (including Anniversary Update).
Avast For Mac Every Website Not Secure Mean
Managing exceptions or turning off Avast protection may leave your computer at risk.