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.... Nothing works!!! HELP:(

  • 4 replies
  • 2 have this problem
  • 4 views
  • Last reply by kinganik

kinganik
kinganik
more options

www.facebook.com uses an invalid security certificate. 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. Error code: SEC_ERROR_UNKNOWN_ISSUER

I tried everything on forum. There is no add exception button. this problem also exist in chrome and IE. FB, Twitter, youtube, linkedin all shows the error. Using VPN solves the problem a little. HOWEVER All other computers in same network work just fine.

PLEASE HELP..

www.facebook.com uses an invalid security certificate. 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. Error code: SEC_ERROR_UNKNOWN_ISSUER I tried everything on forum. There is no add exception button. this problem also exist in chrome and IE. FB, Twitter, youtube, linkedin all shows the error. Using VPN solves the problem a little. HOWEVER All other computers in same network work just fine. PLEASE HELP..
Attached screenshots

Modified by kinganik

All Replies (4)

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
more options

You can click the "Advanced" button to expand this section and show extra details. If the certificate is not trusted because no issuer chain was provided (SEC_ERROR_UNKNOWN_ISSUER) then click the blue error message to expand this section and show the certificate chain. Please click "Copy text to clipboard" and paste this base64 encoded certificate chain text in a reply. That will allow us to check details like the issuer of the certificate.

See also:

Modified by cor-el

kinganik
kinganik Question owner
more options

https://www.facebook.com/

Peer’s Certificate issuer is not recognized.

HTTP Strict Transport Security: true HTTP Public Key Pinning: true

Certificate chain:

BEGIN CERTIFICATE-----

MIIDSjCCAjKgAwIBAgIEWURqODANBgkqhkiG9w0BAQsFADBAMS4wLAYDVQQDDCVD aXNjbyBVbWJyZWxsYSBTZWNvbmRhcnkgU3ViQ0EgaGtnLVNHMQ4wDAYDVQQKDAVD aXNjbzAeFw0xNzA2MTQyMzMwMjlaFw0xNzA2MTkyMzMwMjlaMG0xCzAJBgNVBAYT AlVTMRMwEQYDVQQIDApDYWxpZm9ybmlhMRYwFAYDVQQHDA1TYW4gRnJhbmNpc2Nv MRYwFAYDVQQKDA1PcGVuRE5TLCBJbmMuMRkwFwYDVQQDDBB3d3cuZmFjZWJvb2su Y29tMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAxQmf3UdHdsrxVsia LGho+EK1XzgXySaICwhwT7ytyjEFWV1E+zb0fJS55ReClt8Lxoks3WFy9uHzVgL0 LrYeOjPc9+UkxPLjeXbZHPMrj9/JGDBTKkU3sAjwAIXl2V8WQw2stmtOkPIbZrrL L9tDU/JOq9JJuLdBNP4K/m0wBuXqdVi9PD9FkdgWHi/YOEXE92jw/UsjIIRvuqlI hgr8Epd9b0wHsPXsX42SORsxl6/TGgaR1xZLBrDYaqsryqv3hhModRJsaU/p4f24 B5zwVqbG7+M/pECRKv/yYR8xWLR3eS3Kfkx3kciuGnNdx/EqaY1BZe+mJK3jTO0C CXKf+wIDAQABox8wHTAbBgNVHREEFDASghB3d3cuZmFjZWJvb2suY29tMA0GCSqG SIb3DQEBCwUAA4IBAQAmGKF8CuEZn0PnMj3Pp6D655+w+toZwyC1MqiQ6ZxEwHdI HXUPlWdnyyasSyqvDEyHvK6wO7G5R2X6aHQ4gNFxMRXBxOK84enFYHyH0p/HoeQl pkKbQp3RI1ITzKX7LmKRgilcurTfrkXUl+WKqtE+tmYYo5R0W5pbVOAaCd9/0oA4 +uKAQs94QxmXOisgqAQd2alfnDVz5i1oMwL38T9npOnVzUqnxFHjpgSy0GS5COpf knD/GiU0rCbgs65bKaMQFdi7SRhy9sMfVKVMRpV6ajzq+ejQvyaD2IoMvipiGkh/ Ugah2icgtPhyC5YbK8j6RSsK0a+yT8+F4xFsMSgg

END CERTIFICATE-----
BEGIN CERTIFICATE-----

MIID3TCCAsWgAwIBAgIRAKf8dQRO9kcJlGSf5JZS0GkwDQYJKoZIhvcNAQELBQAw NzElMCMGA1UEAwwcQ2lzY28gVW1icmVsbGEgUHJpbWFyeSBTdWJDQTEOMAwGA1UE CgwFQ2lzY28wHhcNMTcwNjE1MDE0OTM3WhcNMTcwNjI2MDE0OTM3WjBAMS4wLAYD VQQDDCVDaXNjbyBVbWJyZWxsYSBTZWNvbmRhcnkgU3ViQ0EgaGtnLVNHMQ4wDAYD VQQKDAVDaXNjbzCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMUJn91H R3bK8VbImixoaPhCtV84F8kmiAsIcE+8rcoxBVldRPs29HyUueUXgpbfC8aJLN1h cvbh81YC9C62Hjoz3PflJMTy43l22RzzK4/fyRgwUypFN7AI8ACF5dlfFkMNrLZr TpDyG2a6yy/bQ1PyTqvSSbi3QTT+Cv5tMAbl6nVYvTw/RZHYFh4v2DhFxPdo8P1L IyCEb7qpSIYK/BKXfW9MB7D17F+NkjkbMZev0xoGkdcWSwaw2GqrK8qr94YTKHUS bGlP6eH9uAec8Famxu/jP6RAkSr/8mEfMVi0d3ktyn5Md5HIrhpzXcfxKmmNQWXv piSt40ztAglyn/sCAwEAAaOB2jCB1zAfBgNVHSMEGDAWgBQ3QZhaPSAuZ8oNMssn yeDF7bqf6TASBgNVHRMBAf8ECDAGAQH/AgEAMA4GA1UdDwEB/wQEAwIBhjAdBgNV HQ4EFgQUJjw+QIFevVKfgnPsdvaK1P+45eMwcQYIKwYBBQUHAQEEZTBjMCMGCCsG AQUFBzABhhdodHRwOi8vb2NzcC5vcGVuZG5zLmNvbTA8BggrBgEFBQcwAoYwaHR0 cDovL2NhY2VydHMub3BlbmRucy5jb20vNDQ4NjNBQjE1NDY0NThENzIuY3J0MA0G CSqGSIb3DQEBCwUAA4IBAQAQlYxmToW+B/FulLKRKvRyG8SV+BJNKfYiSdTwLnpW 4yX7XmytDza7X7q629LO+vKwNaYEjQ1Fp51R4bWz9yk9Zls96b8G59VBJdDiMRH5 45JKPDjmFPMvT014qa0wO7mAd5CWrOvoFkEhC6gmcVpl2ZFdSYIcVqGzRpwx4pNC mRV/flALsWmgTdVBMS2L7MukN4bStGPftqKYQ56bHEvWCBRvuQoN/qbtjMRS6T8h YCrorE02JlSnAHsHgdW1JhcO2PUdgGv72/Gc15Bz0cW5If1irnmEqtBv9TaALbwg 1LM8fQhbeX3UdQIJAdfeQCT13pRrD0Kos3HPPGkgk9f+

END CERTIFICATE-----
BEGIN CERTIFICATE-----

MIIEgTCCA2mgAwIBAgIJBEhjqxVGRY1yMA0GCSqGSIb3DQEBCwUAMDExDjAMBgNV BAoTBUNpc2NvMR8wHQYDVQQDExZDaXNjbyBVbWJyZWxsYSBSb290IENBMB4XDTE2 MDYyODE1NDAxMVoXDTIxMDYyODE1NDAxMVowNzElMCMGA1UEAwwcQ2lzY28gVW1i cmVsbGEgUHJpbWFyeSBTdWJDQTEOMAwGA1UECgwFQ2lzY28wggEiMA0GCSqGSIb3 DQEBAQUAA4IBDwAwggEKAoIBAQCvR/Tm+U0VahUptIKAkU7BwSKgO1HO0CMdZXCO OLFh9+pCoG1Ly7UiudFAumlfA4kzs1SS9xR2ax0TYIQG84hJsoOPSaZU6wkWWJDq mZVD4+LSPZLUuMWbgWy8/BuqKKL32JjInU/LRXF3AaapHT6eprR5vv5MYSWzFv4r QzhMXy8i8eK48EKsQyf3UBUHdUmOQFBYuRkYlKdave0ipxjMUYKh6DwJX+5psl7S lwHxzKxppwBqZhI5GiuWIs4RhuB+1hOr1zuAb9Oy8WNryXTijXQJ+thl74oo0CoV XS2nZQyDk1X2CUOpTy2Kj4W4ucd4Y1jRp37FkWQwivWq5DU5AgMBAAGjggGUMIIB kDAOBgNVHQ8BAf8EBAMCAYYwEgYDVR0TAQH/BAgwBgEB/wIBATBSBgNVHSAESzBJ MEcGCisGAQQBCRUBHQAwOTA3BggrBgEFBQcCARYraHR0cDovL3d3dy5jaXNjby5j b20vc2VjdXJpdHkvcGtpL3BvbGljaWVzLzAdBgNVHQ4EFgQUN0GYWj0gLmfKDTLL J8ngxe26n+kwTAYDVR0fBEUwQzBBoD+gPYY7aHR0cDovL3d3dy5jaXNjby5jb20v c2VjdXJpdHkvcGtpL2NybC9jaXNjb3VtYnJlbGxhcm9vdC5jcmwwgYcGCCsGAQUF BwEBBHsweTBJBggrBgEFBQcwAoY9aHR0cDovL3d3dy5jaXNjby5jb20vc2VjdXJp dHkvcGtpL2NlcnRzL2Npc2NvdW1icmVsbGFyb290LmNlcjAsBggrBgEFBQcwAYYg aHR0cDovL3BraWN2cy5jaXNjby5jb20vcGtpL29jc3AwHwYDVR0jBBgwFoAUQ3MA 3iS6QBpAVCx9fNUASIkMcKQwDQYJKoZIhvcNAQELBQADggEBAAhlqdX9AAHOyNPv KA44ulyoprNnXp62XeYnlKRgCPvShWW2eDIMOePS8+RvuPGJdtAm1YoPa9hn0WO2 L+jHmnob7so2yc3c02uio9Q4VqPCuA1T/RmmXerpvHtxx1FfUhboBoiGvP/dnFTX DF0lzLEllP3tYZOH0wjsTjhPERN60zR29lKHludW9ZRc5Fkxj5ZwALvAZ2Iqb0HG DwIhJJjXUpJjZXQPRGQ8N+VDx2UqTf74g/rpKcALUERGFrrJMO0Z7yaiqVsVQ9/J 4FAJCjB6fkivL5SvmDWCB1ZeiRc2ud5qm/II0OuGdtX+mo0/Lo9Lh9Tdg2LxUxEn 7cAtMK0=

END CERTIFICATE-----
cor-el
cor-el
  • Moderator
  • Top 10 Contributor
more options

The certificate is issued by Cisco Umbrella.

Do you have security software or content filtering software that intercepts the connection or use a VPN?

The last certificate in the chain links to Cisco Umbrella Root CA. You do not have this root certificate installed 

Subject:	C=US, ST=California, L=San Francisco, O=OpenDNS, Inc., CN=www.facebook.com
Issuer: 	CN=Cisco Umbrella Secondary SubCA hkg-SG, O=Cisco

Subject: 	CN=Cisco Umbrella Primary SubCA, O=Cisco
Issuer: 	O=Cisco, CN=Cisco Umbrella Root CA
kinganik
kinganik Question owner
more options

No I dont have security software or content filtering software that intercepts the connection. I have Vpn plugin with firefox(use when needed).

What should I do now?