Disabling HTTPS certificate check (not recommended) In case you’re still encountering the same MOZILLA_PKIX_ERROR_MITM_DETECTED error even after you disabled HTTPS filtering, move down to the next potential fix below. Disabling the Toggle associated with Enable SSL / TLS protocol filteringĪfter you do this, restart your machine and see if the issue is resolved at the next system startup.
Note: Here’s how to fix the SSL_ERROR_BAD_CERT_DOMAIN in Mozilla.įor example, in ESET Smart Security, you can do this by going to Web and Email > SSL / TLS and disabling the toggle associated with Enable SSL / TLS protocol filtering. After you do this, click Ok to save the changes, then click Yes at the UAC (User Account Control) to grant administrative privileges. If you don’t know how to do this yourself, search online for specific steps. If this scenario is applicable and you’re using a 3rd party suite that you suspect might be using HTTPS scanning or filtering, you’ll need to access your AV settings and disable the option that might be causing the issue. Of course, depending on the 3rd suite that you’re using, you might find it under different names in the settings menu: Scan SSL In most cases, this happens because a 3rd party AV is sending details about your connections (IIRC). In most cases, this issue will occur due to a false positive that convinces your browser that a MITM (man in the middle) is underway on your computer. Avast, Kaspersky, ESET and a few other security suites all use HTTPS scanning/filtering functionality. Enabling HTTPS Scanning/ filteringĪs it turns out, one of the most common causes with the potential of triggering this issue is a security option that’s typically enforced by 3rd party AV suite. How to Fix the MOZILLA_PKIX_ERROR_MITM_DETECTED Error? 1. In rare circumstances, a VPN network or a Proxy server can also trigger this error in your Firefox browser. This is dangerous, mainly because this error can also be occurred by a malware app (Legendas) that is known to mine cryptocurrencies and extract behavioral data.
You can fix this either by disabling the security feature or by uninstalling the security suite altogether.Īlthough it’s not recommended, you can also avoid this error by disabling the HTTPS certificate check from your Mozilla Firefox browser. Most commonly this issue is caused by a 3rd party AV interference caused by HTTPS scanning or filtering. For most affected users, the issue only occurs on Mozilla Firefox – the website is accessible from other browsers. This is typically reported with, and a few other HTTPS websites. The MOZILLA_PKIX_ERROR_MITM_DETECTED error occurs when affected users attempt to access one or more nameservers.
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