Now you can access various websites using the HTTPS protocol without any problem in any web browser. Conclusion: Disabling the HTTPS scanning for avast! Antivirus can solve some of the issues that you may have when accessing the secure websites over the HTTPS protocol. Several Sites are blocked saying the certificate is invalid. I can access all of them with another browser. Hi pipefitter619, did you recently use Firefox's Reset feature or update your avast! Avast Web Shield has a feature to intercept and scan your web traffic. This involves presenting a fake certificate to Firefox, otherwise. Avast Web Shield Processes all traffic coming over HTTP and encrypted HTTPS connections, using URL detection algorithms to protect against phishing as well as full content filtering to stop malware. The Avast shields use a network proxy which scans all the network traffic on your system. IPv6 network connections are immediately closed. Most clients do not attempt to connect using IPv4 so threatening destination servers become inaccessible. The Avast shields use a network proxy which scans all the network traffic on your system. IPv6 network connections are immediately closed. Most clients do not attempt to connect using IPv4 so threatening destination servers become inaccessible.

As soon as I installed the new version of the avast! antivirus on my Windows 8.1 PC, I started to have a strange problem. I could no longer access any of the websites over the HTTPS protocol. Trying to access even the known secure sites like Google and Yahoo showed me expired or invalid certificate errors. Assuming it to be some malware attack, I scanned all of my hard disk with avast! antivirus, and then with Malwarebytes’ Antimalware but could not find anything. After thirty minutes had been spent, I finally started to go through the avast! settings and figured out the culprit – avast! was set to scan HTTPS traffic and was injecting its own SSL/TLS certificate in place of the original certificates of different websites.

There are two solutions for this problem – either you allow the avast! certificate as an exception in various applications like Firefox, Chrome, Thunderbird etc., or you just disable the HTTPS scanning in avast!. The second method is much easier and you do not have to make changes in different applications individually. Here is how you can disable HTTPS scanning in avast! antivirus to fix the untrusted connection / invalid certificate / expired certificate errors :

Avast For Mac Web Shield Blocking All Internet Access

Double-click on the avast! antivirus icon in the Windows system tray to open the main avast! interface. You can also launch it from Start Menu or the Search Charms.
In the avast! antivirus window, click on the Settings near the left-bottom corner.
In the avast! settings window, select Active Protection from the left panel. Then click on Customize shown for the Web Shield module.
Under the main settings for the Web Shield, un-check the checkbox that says Enable HTTPS Scanning and click on the OK button.
That’s it. Now you can access various websites using the HTTPS protocol without any problem in any web browser.

Conclusion: Disabling the HTTPS scanning for avast! antivirus can solve some of the issues that you may have when accessing the secure websites over the HTTPS protocol. But at the same time, it makes your PC a little but less secure as avast! won’t be able to scan any malicious code being downloaded over a secure connection. If you do not want to disable HTTPS scanning, then you will have to add the exceptions for every secure website that you want to visit in a web browser like Firefox.

Avast Security Pro for Mac is the professional version of the hugely popular AV program. Efficient and comprehensive, the popularity stems from the reliable and trustworthy brand that Avast have created over the years. Although virus and malware issues are not as prevalent on the Mac platform as they are on Windows, there are serious threats out there that you will need protection from. Avast Security Pro for Mac's key features are the advanced ransomware protection tools and the advanced network security tools.

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Avast Security Pro’s Ransomware Shield expands on the standard ransomware protection of Avast Free Mac Security, in order to stop ransomware variants from holding your files hostage. The tool can even go beyond the standard ransomware protection in order to stop any untrusted app from changing or deleting your protected data.

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Mail Shield.
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File Shield.
Web Shield.
WiFi Inspector.

Avast Web Shield

Comprehensive Protection is something that Avast takes very seriously. With Avast Security Pro for Mac you can be sure that your protection is first rate. With a constantly updated database of virus definitions, your computer will be protected against the latest spyware, viruses and potentially hazardous websites.

Avast’s large and active community quickly alerts the development team of new security threats which are swiftly countered and added to Avast’s significant database. The browser add-on further improves computer security with features like cookie and social tracking blocking.

Avast Web Shield Blocking Internet

Overall, Avast Security Pro for Mac is without a doubt, one of the best total security suite's available for the Mac platform. It is relatively lightweight and super-efficient, while still providing a comprehensive security protection for your Mac. The appearance is clean and uncluttered, with buttons intuitively labelled and positioned, so the app can be navigated by users of all levels of expertise.

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