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In Bullguard security products you can disable the interception of secure connections on particular major websites like Google, Yahoo and Facebook: You can try to repair or remove the program instead when you're having problems accessing secure websites.įor corporate Bitdefender products, please refer to this Bitdefender Support Center page. In Bitdefender Antivirus Free it's not possible to control this setting. In older versions of the product you can find the corresponding option labelled Scan SSL when you go to Modules > Web Protection

You could try reinstalling it, which might trigger the software into placing its certificates into the Firefox trust store again. Third-party antivirus software can interfere with Firefox's secure connections. In particular, the error code MOZILLA_PKIX_ERROR_MITM_DETECTED indicates that Firefox detected connection interception. The most common causes are security software scanning encrypted connections, or malware listening in and replacing legitimate website certificates with their own. If you get this problem on multiple unrelated HTTPS-sites, it indicates that something on your system or network is intercepting your connection and injecting certificates in a way that is not trusted by Firefox. The error occurs on multiple secure sites

If you click the Advanced button on a "Warning: Potential Security Risk Ahead" error page and you see the error code SEC_ERROR_UNKNOWN_ISSUER or MOZILLA_PKIX_ERROR_MITM_DETECTED, it means that the provided certificate was issued by a certificate authority that is not known by Firefox and, therefore, cannot be trusted by default.