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secure websites won't open

  • 11 replies
  • 1 has this problem
  • Last reply by mpexton

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Last night firefox stopped letting me open any https websites. Chrome doesn't have any problems, just firefox. I have version 63.0.3. I have tried everything that I find on the internet to try. I have windows 10 and am using the windows defender firewall, there are no family settings that are set up. Can anyone help? Below is a screen shot of what I am getting when I try to go to

All Replies (11)

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Apparently the picture didn't go through

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

Websites don't load - troubleshoot and fix error messages

  • uses an invalid security certificate SSL_ERROR_BAD_CERT_DOMAIN
  • configured their website improperly

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

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Thanks Fred. As I stated before I have no other anti virus software installed on the computer. I have tried everything in all those articles. I have been at this for a few hours now and still not working.

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Now I have tried uninstalling and reinstalling firefox. It's pretty bad when I can't even get to the mozilla page!

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Peer’s Certificate issuer is not recognized.

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

Certificate chain:


MIIDsTCCApmgAwIBAgIRAMXf3quPlzT1mm7aFqN7L7YwDQYJKoZIhvcNAQELBQAw NTELMAkGA1UEBhMCRU4xJjAkBgNVBAMMHVVUSUxJTEFCIFNlYXJjaCBHVUFSRElB TiBDQSAyMB4XDTE3MDIxNDAwMDAwMFoXDTIwMDUxNDEyMDAwMFowgY8xCzAJBgNV BAYTAlVTMRMwEQYDVQQIEwpDYWxpZm9ybmlhMRYwFAYDVQQHEw1Nb3VudGFpbiBW aWV3MRswGQYDVQQKExJNb3ppbGxhIEZvdW5kYXRpb24xFzAVBgNVBAsTDkNsb3Vk IFNlcnZpY2VzMR0wGwYDVQQDExRhY2NvdW50cy5maXJlZm94LmNvbTCBnzANBgkq hkiG9w0BAQEFAAOBjQAwgYkCgYEA0m3fMgcltqwa7cjOsMyj7dZqxtuJsEKuECBn hF1pkYmfi/BJq1URqxhJ2q1P+YRKJSz97pq6mfyHCUUUonm7UKnj4OfrrQpnEaPi ZpOr5LYaRvLUjP71qxMRm26XwAvIcFvJnbKnq5ay/Qq6iPLfu6/cTQ578saBWVPM QZ+oKS0CAwEAAaOB5DCB4TCBsQYDVR0RBIGpMIGmghRhY2NvdW50cy5maXJlZm94 LmNvbYIYYXBpLmFjY291bnRzLmZpcmVmb3guY29tghtzY3J5cHQuYWNjb3VudHMu ZmlyZWZveC5jb22CHXZlcmlmaWVyLmFjY291bnRzLmZpcmVmb3guY29tghpvYXV0 aC5hY2NvdW50cy5maXJlZm94LmNvbYIccHJvZmlsZS5hY2NvdW50cy5maXJlZm94 LmNvbTAMBgNVHRMBAf8EAjAAMB0GA1UdJQQWMBQGCCsGAQUFBwMBBggrBgEFBQcD AjANBgkqhkiG9w0BAQsFAAOCAQEATdK930F4Wn5Rf3bZe7gtxik105wCvCzBV3xI C1MEYchZZZYZB68TTGs/csJwb5lMBPio12H20ULkvEEvaQoUoVC/g4iZZ5VVxP93 CfOjbhBzBkEDlcEpotTA3DGV8UfeoOmkdBKr9kSgEDG46DxtkXJfIKMqrt5YPkty tC1n8xkbWTwoRpbAckw4zWiCdQXPQCgQ0Z32caBjQtyS/Z7uvPP0b53pR30zqPrM z5uPOBMy3eVHD9zZb7r3O9ywdQBpWj1FgAU83j/XIFAJLM3VeJJVKxfa3upGUeYG heRywdMKijMuZCSXKeKvNesJtxI8jOtsuo+0XwPyKV6uTScOJA==

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The data looks okay to me

Check Information Valid To 14 May 2020 ( 519 days ) Weak-Key Does not use a key on our blacklist - this is good Key-Size 1024 bits Signature Algorithm Strong (sha256WithRSAEncryption)

Certificate Summary Subject RDN Value Common Name (CN) Organizational Unit (OU) Cloud Services Organization (O) Mozilla Foundation Locality (L) Mountain View State (ST) California Country (C) US

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This Connection Is Untrusted is sometimes caused because the computer system clock is wrong. Check the time / date / timezone settings.

What programs are you using for protection? As a test, disable them.

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The issuer of the certificate is UTILILAB Search GUARDIAN


Does that ring a bell?

You can set this pref to true on the about:config page in case other software adds its root certificate to the Windows certificate store.

  • security.enterprise_roots.enabled = true

Modified by cor-el

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Fred-Windows defender. Turned it off yesterday and no change

Cor-el- I think I tried that yesterday and it worked but I didn’t think I could leave that as true. Is that something I can do?

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A Google search suggests that this might be related to some malware.

Do a malware check with several malware scanning programs on the Windows computer.

Please scan with all programs because each program detects different malware. All these programs have free versions.

Make sure you update each program to get the latest version of their databases before doing a scan.

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Cor-el, thanks for the reply. I downloaded all those and ran them. Re-started my computer and still the same error message.