This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was archived. Please ask a new question if you need help.

SEC_ERROR_UNKNOWN_ISSUER on every website

  • 1 jibu
  • 3 wana tatizo hili
  • 1 view
  • Last reply by FredMcD

Frozer
Frozer
more options

I get "Connection is not secure" on every website. Error code is SEC_ERROR_UNKNOWN_ISSUER. Certificate issuer on every website is "ffeb984503f19da0 2". Problem is only on Mozilla Firefox. I've tried to reinstall and refresh Mozilla without success. I don't have avast, kaspersky or others which have been causing same kind of problems. I've run three programs full virus/malware scans without any found threats. I'm pretty sure that that certificate issuer is the problem but I have no idea how to fix it or what causes it. Help please. Thank you!

I get "Connection is not secure" on every website. Error code is SEC_ERROR_UNKNOWN_ISSUER. Certificate issuer on every website is "ffeb984503f19da0 2". Problem is only on Mozilla Firefox. I've tried to reinstall and refresh Mozilla without success. I don't have avast, kaspersky or others which have been causing same kind of problems. I've run three programs full virus/malware scans without any found threats. I'm pretty sure that that certificate issuer is the problem but I have no idea how to fix it or what causes it. Help please. Thank you!
Attached screenshots

Modified by Frozer

All Replies (1)

FredMcD
FredMcD
more options

There is security software like Avast, Kaspersky, BitDefender and ESET that intercept secure connections and send their own certificate.

https://support.mozilla.org/en-US/kb/firefox-cant-load-websites-other-browsers-can

https://support.mozilla.org/en-US/kb/firefox-and-other-browsers-cant-load-websites

How to troubleshoot the error code "SEC_ERROR_UNKNOWN_ISSUER" on secure websites https://support.cdn.mozilla.net/media/uploads/images/thumbnails/2017-06-07-08-34-22-cb6da3.png

https://support.mozilla.org/en-US/kb/troubleshoot-SEC_ERROR_UNKNOWN_ISSUER