How to fix Error code: SEC_ERROR_UNKNOWN_ISSUER
Follow Steps to fix Error code: SEC_ERROR_UNKNOWN_ISSUER or Call 1-800-2402551 Mozilla Firefox Browser Support Number for Help
What does this error code mean During a secure connection a website needs to provide a certificate issued by a trusted certificate authority in order to ensure that the user is connected to the intended target and the connection is encrypted. If you get a "Your connection is not secure" error page and see the error code "SEC_ERROR_UNKNOWN_ISSUER" after you click on Advanced, it means that the certificate provided was issued by a certificate authority that is not known by Firefox and therefore cannot be trusted by default.
The error occurs on multiple secure sites In case 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 most common causes are security software scanning encrypted connections or malware listening in, replacing legitimate website certificates with their own. Antivirus products Generally, if your security product contains a feature to scan encrypted connections, you could try to reinstall the security product, which might trigger the software to place its certificates into the Firefox trust store again. Try the following solutions for particular security products:
Avast 1. In Avast security products you can disable the interception of secure connections: 2. Open the dashboard of your Avast application. 3. Go to Settings > Active Protection and click Customize next to Web Shield. 4. Uncheck the Enable HTTPS Scanning setting and confirm this by clicking OK
Bitdefender 1. In Bitdefender security products you can disable the interception of secure connections: 2. Open the dashboard of your Bitdefender application. 3. For the 2016 version of the Bitdefender security product, click 4. on Modules. For the 2015 version of Bitdefender, click on Protection. 5. Click on Web Protection. 6. Toggle off the Scan SSL setting.
Bullguard In Bullguard security products you can disable the interception of secure connections on particular major websites like Google, Yahoo and Facebook: 1. Open the dashboard of your Bullguard application. 2. Click on Antivirus settings > Browsing. 3. Uncheck the Show safe results option for those websites which are showing an error message.
ESET In ESET security products you can try to disable and reenable SSL/TLS protocol filtering or generally disable the interception of secure connections
Kaspersky 1. In Kaspersky security products you can disable the interception of secure connections: 2. Open the dashboard of your Kaspersky application. 3. Click on Settings on the bottom-left. 4. Click Additional and then Network. 5. If you use a 2016 version of Kaspersky: In the Encrypted connections scanning section check the Do not scan encrypted 6. connections option and confirm this change. Alternatively you can click on Advanced Settings in order to try to trigger a reinstallation of Kaspersky's certificate. In the dialog that opens click on Install certificate‌ and follow the on-screen instructions.
If you use a 2015 version of Kaspersky: uncheck the Scan encrypted connections option. Finally, reboot your system for the changes to take effect.
The error occurs on one particular site only In case you get this problem on one particular site only, this type of error generally indicates that the web server is not configured properly. However, if you see this error on a legitimate major website like Google or Facebook or sites where financial transactions take place
Missing intermediate certificate
On a site with a missing intermediate certificate you will see the following error description after you click on Advanced on the "Your connection is not secure" error page: The certificate is not trusted because the issuer certificate is unknown. The server might not be sending the appropriate intermediate certificates. An additional root certificate may need to be imported. The website's certificate might not have been issued by a trusted certificate authority itself and no complete certificate chain to a trusted authority was provided either (a so-called "intermediate certificate" is missing). You can test if a site is properly configured by entering a website's address into a third-party tool like SSL Labs‘ test page. If it is returning the result "Chain issues: Incomplete", a proper intermediate certificate is missing. You should contact the owner of the website you're having troubles accessing to inform him of that problem.
Self-signed certificate On a site with a self-signed certificate you will see the following error description after you click on Advanced on the "Your connection is not secure" error page: The certificate is not trusted because it is self-signed. A self-signed certificate that wasn't issued by a recognized certificate authority is not trusted by default. Self-signed certificates can make your data safe from eavesdroppers, but say nothing about who the recipient of the data is. This is common for intranet websites that aren't available publicly and you may bypass the warning for such sites.
Bypassing the warning Warning: You should never add a certificate exception for a legitimate major website or sites where financial transactions take place – in this case an invalid certificate can be an indication that your connection is compromised by a third party. • If the website allows it, you can add an exception in order to visit the site, in spite its certificate is not being trusted by default: • On the warning page, click Advanced. • Click Add Exception…. The Add Security Exception dialog will appear. • Read the text describing the problems with the website. You can click View… in order to closer inspect the untrusted certificate as well.
Click Confirm Security Exception if you are sure you want to trust the site.
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