Hi macminis, when you click the Advanced button, what is the error code (usually starts with SEC_ERROR)? This article covers one of the most common ones users report, but there are a variety of them, so before giving lots of steps, it would be helpful to know what you're facing. [[How to troubleshoot the error code "SEC_ERROR_UNKNOWN_ISSUER" on secure websites]]

When I try to go to www.mozilla.org it says: sec error cert signature algorithm disabled Here's the picture: https://prod-cdn.sumo.mozilla.net/uploads/images/2018-04-19-17-10-08-a8a5c9.png Do you know how I can replace the deleted certificates?

I'm puzzled why your Firefox is giving that code for this site. There may be some program intercepting your connections. A couple years ago, the E-Rewards program caused this issue: https://support.mozilla.org/questions/1102102 However, it may be something new. If you click the SEC_ERROR_CERT_SIGNATURE_ALGORITHM_DISABLED code, does Firefox display a panel with an encoded version of the certificate -- looks like a large block of gibberish? If you see that, please click the button to copy it and then paste it into a reply. Then we can decode the certificate and get a better idea of what's going on. If you do not get a large block of gibberish when clicking that link, you may need to investigate using a different site that is a little less strict with its security. For example: https://www.userchrome.org/ Do you get the error there? Assuming so: click the Advanced button, then click the "Add Exception" button (see first screenshot below). We're not really going to add an exception, but we can get a better view of the certificate here. In the Add Exception dialog, click the "View" button to pop up a certificate viewer. The interesting part is the "Issued by" section. I've marked that on the second screenshot for reference. On my site, the "Issued by" section shows me "Let's Encrypt Authority X3". What do you see there? (These example screenshots are from a test page, not my site) <img src="https://prod-cdn.sumo.mozilla.net/uploads/images/2018-01-26-20-20-02-900b0c.png" width="500"> <img src="https://prod-cdn.sumo.mozilla.net/uploads/images/2018-01-26-20-20-27-291465.png" width="500">

Sec error was cert signature algorithm disabled.  

I tried to go to www.mozilla.org it said: Sec error was cert signature algorithm disabled. I clicked on the error message. The first block of gibberish is what I saw. I tried www.userchrome.org and it worked. I had never been there before. I tried www.npr.org and it worked. I go there almost daily. I changed the default search engine back to google and tried a search. It said: Your connection is not secure... I clicked Advanced. “Sec error unknown issuer” I clicked on the error message. The second block of gibberish is what I saw. I didn't see an exception button. https://www.mozilla.org/ The certificate was signed using a signature algorithm that is disabled because it is not secure. HTTP Strict Transport Security: true HTTP Public Key Pinning: false Certificate chain: -----BEGIN CERTIFICATE----- MIIH+TCCBuGgAwIBAgIQCLTVuQqUkB24PV+Clbic+TANBgkqhkiG9w0BAQsFADB1 MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3 d3cuZGlnaWNlcnQuY29tMTQwMgYDVQQDEytEaWdpQ2VydCBTSEEyIEV4dGVuZGVk IFZhbGlkYXRpb24gU2VydmVyIENBMB4XDTE2MTEwOTAwMDAwMFoXDTE4MTExNDEy MDAwMFowggECMR0wGwYDVQQPDBRQcml2YXRlIE9yZ2FuaXphdGlvbjETMBEGCysG AQQBgjc8AgEDEwJVUzEbMBkGCysGAQQBgjc8AgECEwpDYWxpZm9ybmlhMREwDwYD VQQFEwhDMjc1OTIwODEeMBwGA1UECRMVNjUwIENhc3RybyBTdCBTdGUgMzAwMQ4w DAYDVQQREwU5NDA0MTELMAkGA1UEBhMCVVMxEzARBgNVBAgTCkNhbGlmb3JuaWEx FjAUBgNVBAcTDU1vdW50YWluIFZpZXcxHDAaBgNVBAoTE01vemlsbGEgQ29ycG9y YXRpb24xFDASBgNVBAMTC21vemlsbGEub3JnMIIBIjANBgkqhkiG9w0BAQEFAAOC AQ8AMIIBCgKCAQEAojTWgYqURVDP291yrYhgqecAn++PQjzOesgJkZoPQdd4JuJM xg4Cxbfp00qpjJv9DNWCoQsYGGRNyXL6Xmxy7PVwD5m+2C27ogOa0xSBP5hBr07C aqQ1yAJw0RKwGilLbiiSzJoy21AUyY/uKxKogfMM9nnTfF4TQaYkahyeOCjhoIXW 2/nhoRvmzQkKtCc3kdKE64j8PgmeImu3nV4uw6XNj48umyuhHG+6G5Svt7d/DhSo TNKoiyigf4lLZuVCY3fwLVQh2Rx1Xz+cMpXLU6OIqdnZbDa9hlEFgN2C6MoSmcfo 6BX8Ruvyzqc2f+FNDGwjCGiAlxes3ZhcSwFjsQIDAQABo4ID9DCCA/AwHwYDVR0j BBgwFoAUPdNQpdagre7zSmAKZdMh1Pj41g8wHQYDVR0OBBYEFCqAuKQ3S0o1NBRk MZ7we/y2w6CTMCcGA1UdEQQgMB6CC21vemlsbGEub3Jngg93d3cubW96aWxsYS5v cmcwDgYDVR0PAQH/BAQDAgWgMB0GA1UdJQQWMBQGCCsGAQUFBwMBBggrBgEFBQcD AjB1BgNVHR8EbjBsMDSgMqAwhi5odHRwOi8vY3JsMy5kaWdpY2VydC5jb20vc2hh Mi1ldi1zZXJ2ZXItZzEuY3JsMDSgMqAwhi5odHRwOi8vY3JsNC5kaWdpY2VydC5j b20vc2hhMi1ldi1zZXJ2ZXItZzEuY3JsMEsGA1UdIAREMEIwNwYJYIZIAYb9bAIB MCowKAYIKwYBBQUHAgEWHGh0dHBzOi8vd3d3LmRpZ2ljZXJ0LmNvbS9DUFMwBwYF Z4EMAQEwgYgGCCsGAQUFBwEBBHwwejAkBggrBgEFBQcwAYYYaHR0cDovL29jc3Au ZGlnaWNlcnQuY29tMFIGCCsGAQUFBzAChkZodHRwOi8vY2FjZXJ0cy5kaWdpY2Vy dC5jb20vRGlnaUNlcnRTSEEyRXh0ZW5kZWRWYWxpZGF0aW9uU2VydmVyQ0EuY3J0 MAwGA1UdEwEB/wQCMAAwggH3BgorBgEEAdZ5AgQCBIIB5wSCAeMB4QB1AKS5CZC0 GFgUh7sTosxncAo8NZgE+RvfuON3zQ7IDdwQAAABWEtou44AAAQDAEYwRAIgadQv Taz8vG28WPPQyoD32Nfvekz/WfdMdTjc88YcYC4CIBncp5Yqet7J3JSiNWJnbaeW tBvTjoO6vudBurSFaqWmAHYAaPaY+B9kgr46jO65KB1M/HFRXWeT1ETRCmesu09P +8QAAAFYS2i7XQAABAMARzBFAiEAxbQYHhg6zA3Q7Y1hdXNVtd2yaOg1g4iIV38V eG2WBoMCIAT2azrUy9ndA3hZPPk2hV8YTEItIocJB81F/J4wf2NMAHcAVhQGmi/X wuzT9eG9RLI+x0Z2ubyZEVzA75SYVdaJ0N0AAAFYS2i7+gAABAMASDBGAiEA4/5v iFhhenp07noR8YSkvuiHF+D+6fmDhqcH2shxiboCIQCyPAVUuxnyrWK3PPDbqGx4 YPi5i5DIQUbyT/UiqaOVtwB3AO5Lvbd1zmC64UJpH6vhnmajD35fsHLYgwDEe4l6 qP3LAAABWEtovaIAAAQDAEgwRgIhAJ1S5/U2TqjMRHM8WLpZ+SRroBRoFXqLLj0k EffVe9MtAiEAgxkb74Z6pNVKx898PkNtxICcVRDah4loTSFsftgMAjYwDQYJKoZI hvcNAQELBQADggEBAAAxqPv0YMMRvgwOIKr5s6DqE4fUdkntQZn2y8VkLyNPodUP 5s64ZbnNcceubSPwgqbrXAEVdn2YLyFde1j/npTRfvQH4nPjN8zmIdZFQ/7FYp9b TUFQbouea6gf8/pVUgIFa0945hikojNzIXATFynDFFarpx+h957jOGlfhkXqFEK0 cPrikLhxDrI5LWDv8tcJSW971gDngSY8N3htFgvDkCMVhBuQM02UTW++WuCe5rzW k8vQ3NfJoqy3Vm3YhRpOTF3UFbTXCpmzAb1hgt+iz4k1soCJo9YwOewwd5aS8Bk2 +vjtOafBNN6UdLa4WjRX+JnX5wIANzL9azCzLUc= -----END CERTIFICATE----- -----BEGIN CERTIFICATE----- MIIEtjCCA56gAwIBAgIQDHmpRLCMEZUgkmFf4msdgzANBgkqhkiG9w0BAQsFADBs MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3 d3cuZGlnaWNlcnQuY29tMSswKQYDVQQDEyJEaWdpQ2VydCBIaWdoIEFzc3VyYW5j ZSBFViBSb290IENBMB4XDTEzMTAyMjEyMDAwMFoXDTI4MTAyMjEyMDAwMFowdTEL MAkGA1UEBhMCVVMxFTATBgNVBAoTDERpZ2lDZXJ0IEluYzEZMBcGA1UECxMQd3d3 LmRpZ2ljZXJ0LmNvbTE0MDIGA1UEAxMrRGlnaUNlcnQgU0hBMiBFeHRlbmRlZCBW YWxpZGF0aW9uIFNlcnZlciBDQTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoC ggEBANdTpARR+JmmFkhLZyeqk0nQOe0MsLAAh/FnKIaFjI5j2ryxQDji0/XspQUY uD0+xZkXMuwYjPrxDKZkIYXLBxA0sFKIKx9om9KxjxKws9LniB8f7zh3VFNfgHk/ LhqqqB5LKw2rt2O5Nbd9FLxZS99RStKh4gzikIKHaq7q12TWmFXo/a8aUGxUvBHy /Urynbt/DvTVvo4WiRJV2MBxNO723C3sxIclho3YIeSwTQyJ3DkmF93215SF2AQh cJ1vb/9cuhnhRctWVyh+HA1BV6q3uCe7seT6Ku8hI3UarS2bhjWMnHe1c63YlC3k 8wyd7sFOYn4XwHGeLN7x+RAoGTMCAwEAAaOCAUkwggFFMBIGA1UdEwEB/wQIMAYB Af8CAQAwDgYDVR0PAQH/BAQDAgGGMB0GA1UdJQQWMBQGCCsGAQUFBwMBBggrBgEF BQcDAjA0BggrBgEFBQcBAQQoMCYwJAYIKwYBBQUHMAGGGGh0dHA6Ly9vY3NwLmRp Z2ljZXJ0LmNvbTBLBgNVHR8ERDBCMECgPqA8hjpodHRwOi8vY3JsNC5kaWdpY2Vy dC5jb20vRGlnaUNlcnRIaWdoQXNzdXJhbmNlRVZSb290Q0EuY3JsMD0GA1UdIAQ2 MDQwMgYEVR0gADAqMCgGCCsGAQUFBwIBFhxodHRwczovL3d3dy5kaWdpY2VydC5j b20vQ1BTMB0GA1UdDgQWBBQ901Cl1qCt7vNKYApl0yHU+PjWDzAfBgNVHSMEGDAW gBSxPsNpA/i/RwHUmCYaCALvY2QrwzANBgkqhkiG9w0BAQsFAAOCAQEAnbbQkIbh hgLtxaDwNBx0wY12zIYKqPBKikLWP8ipTa18CK3mtlC4ohpNiAexKSHc59rGPCHg 4xFJcKx6HQGkyhE6V6t9VypAdP3THYUYUN9XR3WhfVUgLkc3UHKMf4Ib0mKPLQNa 2sPIoc4sUqIAY+tzunHISScjl2SFnjgOrWNoPLpSgVh5oywM395t6zHyuqB8bPEs 1OG9d4Q3A84ytciagRpKkk47RpqF/oOi+Z6Mo8wNXrM9zwR4jxQUezKcxwCmXMS1 oVWNWlZopCJwqjyBcdmdqEU79OX2olHdx3ti6G8MdOu42vi/hw15UJGQmxg7kVkn 8TUoE6smftX3eg== -----END CERTIFICATE----- https://www.google.com/search?q=news&ie=utf-8&oe=utf-8&client=firefox-b-1 Peer’s Certificate issuer is not recognized. HTTP Strict Transport Security: false HTTP Public Key Pinning: true Certificate chain: -----BEGIN CERTIFICATE----- MIIDuzCCAqOgAwIBAgIIFfqidtnX/XYwDQYJKoZIhvcNAQELBQAwSTELMAkGA1UE BhMCVVMxEzARBgNVBAoTCkdvb2dsZSBJbmMxJTAjBgNVBAMTHEdvb2dsZSBJbnRl cm5ldCBBdXRob3JpdHkgRzIwHhcNMTgwMzI4MTMyMjAwWhcNMTgwNjIwMTMyMjAw WjBoMQswCQYDVQQGEwJVUzETMBEGA1UECAwKQ2FsaWZvcm5pYTEWMBQGA1UEBwwN TW91bnRhaW4gVmlldzETMBEGA1UECgwKR29vZ2xlIEluYzEXMBUGA1UEAwwOd3d3 Lmdvb2dsZS5jb20wWTATBgcqhkjOPQIBBggqhkjOPQMBBwNCAAS7DS+a3Xnlb/L9 pEA4un6aZvXnewYykFH2T1YtD6sVKhdBeZkan0kJP5yFklKcoGHULb06TU0hKamR mB3EuMldo4IBUTCCAU0wEwYDVR0lBAwwCgYIKwYBBQUHAwEwDgYDVR0PAQH/BAQD AgeAMBkGA1UdEQQSMBCCDnd3dy5nb29nbGUuY29tMGgGCCsGAQUFBwEBBFwwWjAr BggrBgEFBQcwAoYfaHR0cDovL3BraS5nb29nbGUuY29tL0dJQUcyLmNydDArBggr BgEFBQcwAYYfaHR0cDovL2NsaWVudHMxLmdvb2dsZS5jb20vb2NzcDAdBgNVHQ4E FgQUjYCseoF3qs7kDjtxeq1qgTNqQ18wDAYDVR0TAQH/BAIwADAfBgNVHSMEGDAW gBRK3QYWG7z2aLV29YG2u2IaulqBLzAhBgNVHSAEGjAYMAwGCisGAQQB1nkCBQEw CAYGZ4EMAQICMDAGA1UdHwQpMCcwJaAjoCGGH2h0dHA6Ly9wa2kuZ29vZ2xlLmNv bS9HSUFHMi5jcmwwDQYJKoZIhvcNAQELBQADggEBAHQwRfV7L6Gm/IxMuIzpDmRG LwkD3i4AuBTtAiadtMZ6Hb4e8AE3Fsfne2ncP91MreiVS0pmTg7TRQbPDdlXi7Tr w9uPWCvS16gpgJ5FVw4itNjtmevMCUB4h204KkoizBGJhzb9M9NTFEKlyRD/MlnD 2EPBcIGToORexhiP7d+NUXz/bDBK/BIgs/bNnYHQnleJaO+AP0IpXPa8vKgulW8V /QNmjiEELghg5fI3N36LjfIr3s19weAFO4YbL6ENNLSkY+JGBHJiRnO+481F73ei WpKVVoXi7MVSvjgZLn+Zpw+cNxe1CDq24x6Lp9Oiw63NUu/wEAChmBbplJ2vURM= -----END CERTIFICATE----- -----BEGIN CERTIFICATE----- MIIEKDCCAxCgAwIBAgIQAQAhJYiw+lmnd+8Fe2Yn3zANBgkqhkiG9w0BAQsFADBC MQswCQYDVQQGEwJVUzEWMBQGA1UEChMNR2VvVHJ1c3QgSW5jLjEbMBkGA1UEAxMS R2VvVHJ1c3QgR2xvYmFsIENBMB4XDTE3MDUyMjExMzIzN1oXDTE4MTIzMTIzNTk1 OVowSTELMAkGA1UEBhMCVVMxEzARBgNVBAoTCkdvb2dsZSBJbmMxJTAjBgNVBAMT HEdvb2dsZSBJbnRlcm5ldCBBdXRob3JpdHkgRzIwggEiMA0GCSqGSIb3DQEBAQUA A4IBDwAwggEKAoIBAQCcKgR3XNhQkToGo4Lg2FBIvIk/8RlwGohGfuCPxfGJziHu Wv5hDbcyRImgdAtTT1WkzoJile7rWV/G4QWAEsRelD+8W0g49FP3JOb7kekVxM/0 Uw30SvyfVN59vqBrb4fA0FAfKDADQNoIc1Fsf/86PKc3Bo69SxEE630k3ub5/DFx +5TVYPMuSq9C0svqxGoassxT3RVLix/IGWEfzZ2oPmMrhDVpZYTIGcVGIvhTlb7j gEoQxirsupcgEcc5mRAEoPBhepUljE5SdeK27QjKFPzOImqzTs9GA5eXA37Asd57 r0Uzz7o+cbfe9CUlwg01iZ2d+w4ReYkeN8WvjnJpAgMBAAGjggERMIIBDTAfBgNV HSMEGDAWgBTAephojYn7qwVkDBF9qn1luMrMTjAdBgNVHQ4EFgQUSt0GFhu89mi1 dvWBtrtiGrpagS8wDgYDVR0PAQH/BAQDAgEGMC4GCCsGAQUFBwEBBCIwIDAeBggr BgEFBQcwAYYSaHR0cDovL2cuc3ltY2QuY29tMBIGA1UdEwEB/wQIMAYBAf8CAQAw NQYDVR0fBC4wLDAqoCigJoYkaHR0cDovL2cuc3ltY2IuY29tL2NybHMvZ3RnbG9i YWwuY3JsMCEGA1UdIAQaMBgwDAYKKwYBBAHWeQIFATAIBgZngQwBAgIwHQYDVR0l BBYwFAYIKwYBBQUHAwEGCCsGAQUFBwMCMA0GCSqGSIb3DQEBCwUAA4IBAQDKSeWs 12Rkd1u+cfrP9B4jx5ppY1Rf60zWGSgjZGaOHMeHgGRfBIsmr5jfCnC8vBk97nsz qX+99AXUcLsFJnnqmseYuQcZZTTMPOk/xQH6bwx+23pwXEz+LQDwyr4tjrSogPsB E4jLnD/lu3fKOmc2887VJwJyQ6C9bgLxRwVxPgFZ6RGeGvOED4Cmong1L7bHon8X fOGLVq7uZ4hRJzBgpWJSwzfVO+qFKgE4h6LPcK2kesnE58rF2rwjMvL+GMJ74N87 L9TQEOaWTPtEtyFkDbkAlDASJodYmDkFOA/MgkgMCkdm7r+0X8T/cKjhf4t5K7hl MqO5tzHpCvX2HzLc -----END CERTIFICATE----- -----BEGIN CERTIFICATE----- MIIDfTCCAuagAwIBAgIDErvmMA0GCSqGSIb3DQEBBQUAME4xCzAJBgNVBAYTAlVT MRAwDgYDVQQKEwdFcXVpZmF4MS0wKwYDVQQLEyRFcXVpZmF4IFNlY3VyZSBDZXJ0 aWZpY2F0ZSBBdXRob3JpdHkwHhcNMDIwNTIxMDQwMDAwWhcNMTgwODIxMDQwMDAw WjBCMQswCQYDVQQGEwJVUzEWMBQGA1UEChMNR2VvVHJ1c3QgSW5jLjEbMBkGA1UE AxMSR2VvVHJ1c3QgR2xvYmFsIENBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIB CgKCAQEA2swYYzD99BcjGlZ+W988bDjkcbd4kdS8odhM+KhDtgPpTSEHCIjaWC9m OSm9BXiLnTjoBbdqfnGk5sRgprDvgOSJKA+eJdbtg/OtppHHmMlCGDUUna2YRpIu T8rxh0PBFpVXLVDviS2Aelet8u5fa9IAjbkU+BQVNdnARqN7csiRv8lVK83Qlz6c JmTM386DGXHKTubU1XupGc1V3sjs0l44U+VcT4wt/lAjNvxm5suOpDkZALeVAjmR Cw7+OC7RHQWa9k0+bw8HHa8sHo9gOeL6NlMTOdReJivbPagUvTLrGAMoUgRx5asz PeE4uwc2hGKceeoWMPRfwCvocWvk+QIDAQABo4HwMIHtMB8GA1UdIwQYMBaAFEjm aPkr0rKV10fYIyAQTzOYkJ/UMB0GA1UdDgQWBBTAephojYn7qwVkDBF9qn1luMrM TjAPBgNVHRMBAf8EBTADAQH/MA4GA1UdDwEB/wQEAwIBBjA6BgNVHR8EMzAxMC+g LaArhilodHRwOi8vY3JsLmdlb3RydXN0LmNvbS9jcmxzL3NlY3VyZWNhLmNybDBO BgNVHSAERzBFMEMGBFUdIAAwOzA5BggrBgEFBQcCARYtaHR0cHM6Ly93d3cuZ2Vv dHJ1c3QuY29tL3Jlc291cmNlcy9yZXBvc2l0b3J5MA0GCSqGSIb3DQEBBQUAA4GB AHbhEm5OSxYShjAGsoEIz/AIx8dxfmbuwu3UOx//8PDITtZDOLC5MH0Y0FWDomrL NhGc6Ehmo21/uBPUR/6LWlxz/K7ZGzIZOKuXNBSqltLroxwUCEm2u+WR74M26x1W b8ravHNjkOR/ez4iyz0H7V84dJzjA1BOoa+Y7mHyhD8S -----END CERTIFICATE-----

''macminis [[#answer-1103343|said]]'' <blockquote> I tried to go to www.mozilla.org it said: Sec error was cert signature algorithm disabled. I clicked on the error message. The first block of gibberish is what I saw. </blockquote> This looks like the real cert, so I'm not sure why your Firefox is complaining about it. <blockquote>I changed the default search engine back to google and tried a search. It said: Your connection is not secure... I clicked Advanced. “Sec error unknown issuer” I clicked on the error message. The second block of gibberish is what I saw.</blockquote> This also looks like the real cert, so I'm not sure why your Firefox is complaining about it. Could you try deleting the certificate store files and letting Firefox generate new ones (possibly only the newer one will be generated): Open your current Firefox settings (AKA Firefox profile) folder using either * "3-bar" menu button > "?" Help > Troubleshooting Information * (menu bar) Help > Troubleshooting Information * type or paste about:support in the address bar and press Return In the first table on the page, on the Profile Folder row, click the "Show in Finder" button. If Finder highlights an icon with a semi-random name like a1b2c3d4.default, double-click it to display the contents of that profile folder. Leaving that window open, switch back to Firefox and Quit, either: * "3-bar" menu button > Quit * (menu bar) Firefox > Quit Pause while Firefox finishes its cleanup, then rename '''cert9.db''' to something like cert9OLD.db. If you see a file named '''cert8.db''', rename that one to cert8OLD.db. Start Firefox back up again. Any improvement in reaching the Mozilla or Google sites?

Yes! yes and yes! It all works now! A fix that was quick and easy. I had both cert9,db and cert8.db. Thanks. Sent from my first mini.