What is ‘MOZILLA_PKIX_ERROR_MITM_DETECTED error’ in Windows 10/11?
In this article, we are going to discuss on How to fix mozilla_pkix_error_mitm_detected in Firefox, MOZILLA_PKIX_ERROR_MITM_DETECTED error in Windows 10/11. You will be guided with easy steps/methods to resolve the issue. Let’s starts the discussion.
‘mozilla_pkix_error_mitm_detected in Firefox’: It is common Mozilla Firefox error usually occurred when you try to access one or more nameservers. This issue indicates you are unable to access certain websites like duckduckgo.com, reddit.com and few other HTTPS websites in Mozilla Firefox Brower. The error is appeared with ‘Your Connection is not secure’ title with message saying ‘The owner of example.com has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website’.
The possible reasons behind the issue can be the interference of third-party antivirus/firewall program installed in computer causing by HTTPS scanning or filtering. This issue can be occurred due to malware or viruses infections in computer or in Mozilla Firefox browser, issue with HTTPS certificate in browser, interference of VPN or proxy servers, and other issues. It is possible to fix the issue with our instructions. Let’s go for the solution.
How to fix mozilla_pkix_error_mitm_detected in Firefox in Windows 10/11?
Method 1: Fix MOZILLA_PKIX_ERROR_MITM_DETECTED error with ‘PC Repair Tool’
‘PC Repair Tool’ is easy & quick way to find and fix BSOD errors, DLL errors, EXE errors, problems with programs/applications, malware or viruses issues, system files or registry issues, and other system issues with just few clicks.
Method 2: Enable HTTPS Scanning/filtering
One possible way to fix the issue is to enable HTTPs scanning/filtering in your third-party antivirus software. If your Security Software has HTTPs scanning functionality, you can switch it OFF in order to fix. You may find this feature under various names including:
- Scan SSL
- Do not scan encrypted connections
- Show safe results
Method 3: Disable HTTPs canning feature on Mozilla Firefox
Step 1: Open Mozilla Firefox Brower, type ‘about:config’ in URL bar and hit ‘Enter’ key to open the page
Step 2: If an info message shows up, click ‘I accept the risk!’ button. Look for security.enterprise_roots.enabled entry. Once you find it, double-click it to edit, modify the value to ‘True’ and save the changes. Once done, restart Firefox browser and check if the issue is resolved.
Method 4: Uninstall Legendas and disable Com+ Leg Service (if applicable)
This error can also be occurred due to process belong to subtitle program ‘Legendas’. If you got this Legendas application installed in your computer, you can uninstall it ASAP in order to fix.
Step 1: Open ‘Control Panel’ in Windows PC via Windows Search Box and go to ‘Uninstall a Program > Programs & Features’
Step 2: Find and right-click on application ‘Legendas’ or relating programs, and select ‘Uninstall’ to uninstall it and after that, restart your computer.
Step 3: After restart, open ‘Services’ app in Windows PC via Windows Search Box
Step 4: Find and double-click on ‘COM+ Leg Service’ to open its ‘Properties’. Under ‘General’ tab, select ‘Disabled’ option from ‘Startup Type’ dropdown and hit ‘Apply > Ok’ button to save the changes.
Step 5: Once done, restart your computer and check if the issue is resolved.
Method 5: Disable VPN or Proxy Server
Another possible way to fix the issue is to disable VPN or proxy server in computer that might be causing interference with certain websites or HTTPs websites in Firefox browser.
Disable Proxy Server:
Step 1: Open ‘Settings’ app in Windows PC via Windows Search Box and go to ‘Network & Internet > Proxy’
Step 2: Scroll down to ‘Manual proxy setup’ section and disable the toggle associated with ‘Use a proxy server’. Once done, restart your computer and check if the issue is resolved.
Disable or uninstall VPN Connection:
Step 1: Open ‘Control Panel’ in Windows PC via Windows Search Box and go to ‘Uninstall a program > Programs & Features’
Step 2: Right-click on third-party VPN application, select ‘Uninstall’ to uninstall it and once uninstalled, restart your computer and check if the issue is resolved.
Method 6: Uninstall third-party antivirus/firewall program
This issue can be occurred due to interference of third-party antivirus/firewall program installed in computer. You can uninstall third-party antivirus/firewall in order to fix.
Step 1: Open ‘Control Panel’ in Windows PC via Windows Search Box and go to ‘Uninstall a Program > Programs & Features’
Step 2: Find and right-click on third-party antivirus/firewall, and select ‘Uninstall’ to uninstall it. Once uninstalled, restart your computer and check if the issue is resolved.
Conclusion
I am sure this post helped you on How to fix mozilla_pkix_error_mitm_detected in Firefox, MOZILLA_PKIX_ERROR_MITM_DETECTED error in Windows 10/11 with several easy steps/methods. You can read & follow our instructions to do so. That’s all. For any suggestions or queries, please write on comment box below.
