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Lolu chungechunge lwabekwa kunqolobane. Uyacelwa ubuze umbuzo omusha uma udinga usizo.

How to troubleshoot the error code "SEC_ERROR_UNKNOWN_ISSUER" on secure websites

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  • 1 inale nkinga
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  • Igcine ukuphendulwa ngu cor-el

VinhPhan
VinhPhan
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2 days ago (June 25,2018), I can not access websites like facebook, youtube, gmail... The error is as below: " Your connection is not secure

The owner of www.facebook.com has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website.

This site uses HTTP Strict Transport Security (HSTS) to specify that Firefox may only connect to it securely. As a result, it is not possible to add an exception for this certificate.

www.facebook.com uses an invalid security certificate. The certificate is not trusted because the issuer certificate is unknown.

https://www.facebook.com/campaign/landing.php?&campaign_id=345771415869808&extra_1=s|c|230183843426|b|facebook%20com|&placement=&creative=230183843426&keyword=facebook%20com&partner_id=googlesem&extra_2=campaignid%3D947353828%26adgroupid%3D47174142476%26matchtype%3Db%26network%3Dg%26source%3Dnotmobile%26search_or_content%3Ds%26device%3Dc%26devicemodel%3D%26adposition%3D1t1%26target%3D%26targetid%3Dkwd-296408625083%26loc_physical_ms%3D1028580%26loc_interest_ms%3D%26feeditemid%3D%26param1%3D%26param2%3D&gclid=EAIaIQobChMI6K2Yusvx2wIVy4BwCh3B6A6MEAAYASAAEgKPbvD_BwE

Peer’s Certificate issuer is not recognized.

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

Certificate chain:

BEGIN CERTIFICATE-----

MIIDSjCCAjKgAwIBAgIEWzI14zANBgkqhkiG9w0BAQsFADBAMS4wLAYDVQQDDCVD aXNjbyBVbWJyZWxsYSBTZWNvbmRhcnkgU3ViQ0EgaGtnLVNHMQ4wDAYDVQQKDAVD aXNjbzAeFw0xODA2MjQxMjQ3MTJaFw0xODA2MjkxMjQ3MTJaMG0xCzAJBgNVBAYT AlVTMRMwEQYDVQQIDApDYWxpZm9ybmlhMRYwFAYDVQQHDA1TYW4gRnJhbmNpc2Nv MRYwFAYDVQQKDA1PcGVuRE5TLCBJbmMuMRkwFwYDVQQDDBB3d3cuZmFjZWJvb2su Y29tMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAoPjNmwidHUYns0KT fZttD1iKmSrVlAlJVui8GjFyYXjgBJcejkYBE1W/XUy7St98fc1lbFpILzpT0zuU 2YIsAdBuqmDiGDywgyRH0B/E86Xk/5on7fFng6E5k88eD2wlWblWJ3MvDW09Cc/D 3QodB3Jg/h/D3HfccBMM5e+lhvSikHagBifg5LEQ2p6qTFRS20lyRK/PQ8kLBUjq OhCxHsEWVC1QjULW1Gd+Kyin2DR6Aof91PhvGFMpE6qGNpkPscRqKUIdODfu2P71 BvHlmMYlBQhPu/FmW0yYoHrGzN9Bv5BvfZMh2GKxPK+MIPAsq9lWDYGU/Re30c4i TfpkhwIDAQABox8wHTAbBgNVHREEFDASghB3d3cuZmFjZWJvb2suY29tMA0GCSqG SIb3DQEBCwUAA4IBAQANyy6UZmYvzSeSgntfiSfEOTOJupK89BIcoVciS0sGwIyM 73GgHwhQYGnkxXzwZ9otZXJn7tFW9ua1ZR30tZAeJTJAQnkVKKOC7gM1YS1UnPyw vdDrzo4GdA7Wj4j6qdQo0ZZ53QANKA1AEdZvsNoHvdX5D66LQ5lzcSL0oMDhlgai KiH792lDapN9sJmC9I+rGWjcEc5q4YxczRiA0EMjsDlTlS8ZCkrbCXNczJ6N5OLW w6/guUpEUP0cEVc3qK66BFIWqQh3GWBJjaQRgwfl77Yb7w2UxcXRLu4jzzCpsk/Z H+cmog/BC/t0FHY2uDpGWQtpi2I9obv0G0szNzWp

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

MIID3TCCAsWgAwIBAgIRAM/SUtR9T0xghwdb8M0lh9IwDQYJKoZIhvcNAQELBQAw NzElMCMGA1UEAwwcQ2lzY28gVW1icmVsbGEgUHJpbWFyeSBTdWJDQTEOMAwGA1UE CgwFQ2lzY28wHhcNMTgwNjI1MDY1MzQxWhcNMTgwNzA2MDY1MzQxWjBAMS4wLAYD VQQDDCVDaXNjbyBVbWJyZWxsYSBTZWNvbmRhcnkgU3ViQ0EgaGtnLVNHMQ4wDAYD VQQKDAVDaXNjbzCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAKD4zZsI nR1GJ7NCk32bbQ9Yipkq1ZQJSVbovBoxcmF44ASXHo5GARNVv11Mu0rffH3NZWxa SC86U9M7lNmCLAHQbqpg4hg8sIMkR9AfxPOl5P+aJ+3xZ4OhOZPPHg9sJVm5Vidz Lw1tPQnPw90KHQdyYP4fw9x33HATDOXvpYb0opB2oAYn4OSxENqeqkxUUttJckSv z0PJCwVI6joQsR7BFlQtUI1C1tRnfisop9g0egKH/dT4bxhTKROqhjaZD7HEailC HTg37tj+9Qbx5ZjGJQUIT7vxZltMmKB6xszfQb+Qb32TIdhisTyvjCDwLKvZVg2B lP0Xt9HOIk36ZIcCAwEAAaOB2jCB1zAfBgNVHSMEGDAWgBQ3QZhaPSAuZ8oNMssn yeDF7bqf6TASBgNVHRMBAf8ECDAGAQH/AgEAMA4GA1UdDwEB/wQEAwIBhjAdBgNV HQ4EFgQU7GqOIAR562MfUYVjcVQx9a5vUZ4wcQYIKwYBBQUHAQEEZTBjMCMGCCsG AQUFBzABhhdodHRwOi8vb2NzcC5vcGVuZG5zLmNvbTA8BggrBgEFBQcwAoYwaHR0 cDovL2NhY2VydHMub3BlbmRucy5jb20vNDQ4NjNBQjE1NDY0NThENzIuY3J0MA0G CSqGSIb3DQEBCwUAA4IBAQAYeggJYfjXv+18anyEzuk/NLmkib3dULMh1IxrbhrO pQepOZ+Kyl7zgVapeNwTN84sFce9s5a9rWNxCfKoB4ElNFlIAUhupJNaClFVTZZi qNN0gIuZHVTinkv3x5IkTW5+OrbqoB4ltVth5dlMwAsvQ6X5oYDjzq3ZeWjHZo0I 5Keyb3Z90AEsRpSuNWctgRUjRoeBjspiQfWu5N1aYs+4/YJ3i3tAdXnNoAxL1OW1 /XPrL970OUalwl8seRR/f6HfIbh6kmDNK1EF0dpnoAPw1dozH+LfdUbk0XXnwBZw EHZwpF9jkEX3ePsS2fd+i2ak5sGxCzy69Wq2EAkmI1bx

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-----

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

2 days ago (June 25,2018), I can not access websites like facebook, youtube, gmail... The error is as below: " Your connection is not secure The owner of www.facebook.com has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website. This site uses HTTP Strict Transport Security (HSTS) to specify that Firefox may only connect to it securely. As a result, it is not possible to add an exception for this certificate. www.facebook.com uses an invalid security certificate. The certificate is not trusted because the issuer certificate is unknown. https://www.facebook.com/campaign/landing.php?&campaign_id=345771415869808&extra_1=s|c|230183843426|b|facebook%20com|&placement=&creative=230183843426&keyword=facebook%20com&partner_id=googlesem&extra_2=campaignid%3D947353828%26adgroupid%3D47174142476%26matchtype%3Db%26network%3Dg%26source%3Dnotmobile%26search_or_content%3Ds%26device%3Dc%26devicemodel%3D%26adposition%3D1t1%26target%3D%26targetid%3Dkwd-296408625083%26loc_physical_ms%3D1028580%26loc_interest_ms%3D%26feeditemid%3D%26param1%3D%26param2%3D&gclid=EAIaIQobChMI6K2Yusvx2wIVy4BwCh3B6A6MEAAYASAAEgKPbvD_BwE Peer’s Certificate issuer is not recognized. HTTP Strict Transport Security: true HTTP Public Key Pinning: true Certificate chain: -----BEGIN CERTIFICATE----- MIIDSjCCAjKgAwIBAgIEWzI14zANBgkqhkiG9w0BAQsFADBAMS4wLAYDVQQDDCVD aXNjbyBVbWJyZWxsYSBTZWNvbmRhcnkgU3ViQ0EgaGtnLVNHMQ4wDAYDVQQKDAVD aXNjbzAeFw0xODA2MjQxMjQ3MTJaFw0xODA2MjkxMjQ3MTJaMG0xCzAJBgNVBAYT AlVTMRMwEQYDVQQIDApDYWxpZm9ybmlhMRYwFAYDVQQHDA1TYW4gRnJhbmNpc2Nv MRYwFAYDVQQKDA1PcGVuRE5TLCBJbmMuMRkwFwYDVQQDDBB3d3cuZmFjZWJvb2su Y29tMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAoPjNmwidHUYns0KT fZttD1iKmSrVlAlJVui8GjFyYXjgBJcejkYBE1W/XUy7St98fc1lbFpILzpT0zuU 2YIsAdBuqmDiGDywgyRH0B/E86Xk/5on7fFng6E5k88eD2wlWblWJ3MvDW09Cc/D 3QodB3Jg/h/D3HfccBMM5e+lhvSikHagBifg5LEQ2p6qTFRS20lyRK/PQ8kLBUjq OhCxHsEWVC1QjULW1Gd+Kyin2DR6Aof91PhvGFMpE6qGNpkPscRqKUIdODfu2P71 BvHlmMYlBQhPu/FmW0yYoHrGzN9Bv5BvfZMh2GKxPK+MIPAsq9lWDYGU/Re30c4i TfpkhwIDAQABox8wHTAbBgNVHREEFDASghB3d3cuZmFjZWJvb2suY29tMA0GCSqG SIb3DQEBCwUAA4IBAQANyy6UZmYvzSeSgntfiSfEOTOJupK89BIcoVciS0sGwIyM 73GgHwhQYGnkxXzwZ9otZXJn7tFW9ua1ZR30tZAeJTJAQnkVKKOC7gM1YS1UnPyw vdDrzo4GdA7Wj4j6qdQo0ZZ53QANKA1AEdZvsNoHvdX5D66LQ5lzcSL0oMDhlgai KiH792lDapN9sJmC9I+rGWjcEc5q4YxczRiA0EMjsDlTlS8ZCkrbCXNczJ6N5OLW w6/guUpEUP0cEVc3qK66BFIWqQh3GWBJjaQRgwfl77Yb7w2UxcXRLu4jzzCpsk/Z H+cmog/BC/t0FHY2uDpGWQtpi2I9obv0G0szNzWp -----END CERTIFICATE----- -----BEGIN CERTIFICATE----- MIID3TCCAsWgAwIBAgIRAM/SUtR9T0xghwdb8M0lh9IwDQYJKoZIhvcNAQELBQAw NzElMCMGA1UEAwwcQ2lzY28gVW1icmVsbGEgUHJpbWFyeSBTdWJDQTEOMAwGA1UE CgwFQ2lzY28wHhcNMTgwNjI1MDY1MzQxWhcNMTgwNzA2MDY1MzQxWjBAMS4wLAYD VQQDDCVDaXNjbyBVbWJyZWxsYSBTZWNvbmRhcnkgU3ViQ0EgaGtnLVNHMQ4wDAYD VQQKDAVDaXNjbzCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAKD4zZsI nR1GJ7NCk32bbQ9Yipkq1ZQJSVbovBoxcmF44ASXHo5GARNVv11Mu0rffH3NZWxa SC86U9M7lNmCLAHQbqpg4hg8sIMkR9AfxPOl5P+aJ+3xZ4OhOZPPHg9sJVm5Vidz Lw1tPQnPw90KHQdyYP4fw9x33HATDOXvpYb0opB2oAYn4OSxENqeqkxUUttJckSv z0PJCwVI6joQsR7BFlQtUI1C1tRnfisop9g0egKH/dT4bxhTKROqhjaZD7HEailC HTg37tj+9Qbx5ZjGJQUIT7vxZltMmKB6xszfQb+Qb32TIdhisTyvjCDwLKvZVg2B lP0Xt9HOIk36ZIcCAwEAAaOB2jCB1zAfBgNVHSMEGDAWgBQ3QZhaPSAuZ8oNMssn yeDF7bqf6TASBgNVHRMBAf8ECDAGAQH/AgEAMA4GA1UdDwEB/wQEAwIBhjAdBgNV HQ4EFgQU7GqOIAR562MfUYVjcVQx9a5vUZ4wcQYIKwYBBQUHAQEEZTBjMCMGCCsG AQUFBzABhhdodHRwOi8vb2NzcC5vcGVuZG5zLmNvbTA8BggrBgEFBQcwAoYwaHR0 cDovL2NhY2VydHMub3BlbmRucy5jb20vNDQ4NjNBQjE1NDY0NThENzIuY3J0MA0G CSqGSIb3DQEBCwUAA4IBAQAYeggJYfjXv+18anyEzuk/NLmkib3dULMh1IxrbhrO pQepOZ+Kyl7zgVapeNwTN84sFce9s5a9rWNxCfKoB4ElNFlIAUhupJNaClFVTZZi qNN0gIuZHVTinkv3x5IkTW5+OrbqoB4ltVth5dlMwAsvQ6X5oYDjzq3ZeWjHZo0I 5Keyb3Z90AEsRpSuNWctgRUjRoeBjspiQfWu5N1aYs+4/YJ3i3tAdXnNoAxL1OW1 /XPrL970OUalwl8seRR/f6HfIbh6kmDNK1EF0dpnoAPw1dozH+LfdUbk0XXnwBZw EHZwpF9jkEX3ePsS2fd+i2ak5sGxCzy69Wq2EAkmI1bx -----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----- 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

All Replies (2)

Shadow110
Shadow110
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There is security software like Avast/AVG, Kaspersky, BitDefender and ESET that intercept secure connections and send their own certificate.

If you are running one of these programs please visit the community forum of the program for how to adjust your settings. Please let us know if this solved your issue or if need further assistance.

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
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The issuer of the certificate is OpenDNS, so you will have to check the OpenDNS website about how to add its root certificate to Firefox.