hello, a solution depends on the individual circumstances:

• please also give us more information about the error by clicking on the error code, copying the text to the clipboard and then pasting it here into a reply in the forum.

thank you!

https://gmail.com/

Peer’s Certificate issuer is not recognized.

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

Certificate chain:

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MIIH0zCCBbugAwIBAgIKYRxAiQABAAAADDANBgkqhkiG9w0BAQsFADA4MQswCQYD VQQGEwJVUzESMBAGA1UEChMJVVMgU2VuYXRlMRUwEwYDVQQDEwxBRE1BIFJPT1Qg Q0EwHhcNMTYwMjA1MTYwMTEwWhcNMjEwMjA1MTYxMTEwWjCBtzELMAkGA1UEBhMC VVMxEzARBgNVBAgTCldhc2hpbmd0b24xDTALBgNVBAcTBEQuQy4xFDASBgNVBAoT C1UuUy4gU2VuYXRlMSMwIQYDVQQLExpTZWN1cml0eSBPcGVyYXRpb25zIENlbnRl cjEmMCQGA1UEAxMdU2VuYXRlIFdlYiBBc3N1cmFuY2UgUGxhdGZvcm0xITAfBgkq hkiG9w0BCQEWEnNvY0BzYWEuc2VuYXRlLmdvdjCCASIwDQYJKoZIhvcNAQEBBQAD ggEPADCCAQoCggEBAKmo+iSkLQqzmHBzjxV6T726uI9Y7F9lrruLXwbY+SpJ85xn EolxJ3j/rxX1swmfTBOVBy3iRY5nBCuKcIdzEzHqjnBiDEuLAFItNfBQ2aSigNTB /hKpj/5XvSxrHiEnv2WbvEaRiB9yKpPPYwCtMy+TV4Ia7JFfRAS6Z5GxmTezHbUK /CmAjCR5YATVqXrF5HmA6w2udxRh8rzaf/eTTcO9UyOHB/ugFvLVLACU+doDPSiw zHclbd6FqHWgju1kUV02/XOtjahVdoB8DZKiiSsLRYeqTorwE5oU5qI/tKPoWtoN IHr77bKAG4TTqAtetBqvNLmM6H5bvinU/5rVzfkCAwEAAaOCA10wggNZMB0GA1Ud DgQWBBQLTp24DAOla5SycJQkBkSMfZVD6DAfBgNVHSMEGDAWgBRqkBZAXAHvuYml 1295E+/H4WpHhTCCAV0GA1UdHwSCAVQwggFQMIIBTKCCAUigggFEhoG/bGRhcDov Ly9DTj1BRE1BJTIwUk9PVCUyMENBKDEpLENOPXVzLXJvb3QtcGswMSxDTj1DRFAs Q049UHVibGljJTIwS2V5JTIwU2VydmljZXMsQ049U2VydmljZXMsQ049Q29uZmln dXJhdGlvbixEQz11c3NlbmF0ZSxEQz11cz9jZXJ0aWZpY2F0ZVJldm9jYXRpb25M aXN0P2Jhc2U/b2JqZWN0Q2xhc3M9Y1JMRGlzdHJpYnV0aW9uUG9pbnSGP2h0dHA6 Ly9hZG1hcGtpMDEuc2hhcmVkLnVzc2VuYXRlLnVzL2NybC9BRE1BJTIwUk9PVCUy MENBKDEpLmNybIY/aHR0cDovL2FkbWFwa2kwMi5zaGFyZWQudXNzZW5hdGUudXMv Y3JsL0FETUElMjBST09UJTIwQ0EoMSkuY3JsMIIBeAYIKwYBBQUHAQEEggFqMIIB ZjCBrwYIKwYBBQUHMAKGgaJsZGFwOi8vL0NOPUFETUElMjBST09UJTIwQ0EsQ049 QUlBLENOPVB1YmxpYyUyMEtleSUyMFNlcnZpY2VzLENOPVNlcnZpY2VzLENOPUNv bmZpZ3VyYXRpb24sREM9dXNzZW5hdGUsREM9dXM/Y0FDZXJ0aWZpY2F0ZT9iYXNl P29iamVjdENsYXNzPWNlcnRpZmljYXRpb25BdXRob3JpdHkwWAYIKwYBBQUHMAKG TGh0dHA6Ly9hZG1hcGtpMDEuc2hhcmVkLnVzc2VuYXRlLnVzL2FpYS91cy1yb290 LXBrMDFfQURNQSUyMFJPT1QlMjBDQSgxKS5jcnQwWAYIKwYBBQUHMAKGTGh0dHA6 Ly9hZG1hcGtpMDIuc2hhcmVkLnVzc2VuYXRlLnVzL2FpYS91cy1yb290LXBrMDFf QURNQSUyMFJPT1QlMjBDQSgxKS5jcnQwGQYJKwYBBAGCNxQCBAweCgBTAHUAYgBD AEEwEgYDVR0TAQH/BAgwBgEB/wIBADALBgNVHQ8EBAMCAYYwDQYJKoZIhvcNAQEL BQADggIBAIpEfTSjc5SNKsTk7keJZF8a9z7FnkKDv6tZBpAF8C2DeKqKYljzKFJC /HVQPfQZKPVTXg9sc1A5kACvhBhfjlY+xE8yjfoKz/HHdDUziterAP0BkYbczZ6U Ss3j1tx+geyUrz0iRSXf9lFXhsKJU1lDI0l1ws9kXwvqFieVOmzSVubarVtZ2JkF JHGmNV2w3rt+Bm5PqXo/ou4+i9Q5jatV50Stoqm+hs2QCw5NdFJV/UNJ6WUq55A8 gFadwoyFGOiGD5/PylZFsrjXRczxeFM4JhkZtBsSsMQB5FOseYpYkFhzW8WRTUkW eyLiWzSoaiHdEYKWOMlzNXwBlQJOCnpzKwXahrYmU2o/4WlVr3ls1fvuGJIM0LLs ZkWIxekJZyZM3Sf0XBxVgMz3uvojh75vmtRVEpGve4qcJ9DRqD+9W7qxdLXYKrdv FksSnjWLxR5klplvM+QWSUPucKjAam/rntEttAwPWlvmyq8yB1qNiFHJTu5dTDp8 HHz7C6O+cvaiqkosXcFh/jChWr+RIAE3+08jcxmDRvUweIJxXn100G6M8gSuJpFl nl3pVcD8rhH0Xrgpxwb1M3AB5Z4WcBYXnqQgaFGbhMjNfQMLAf2G+4TJrJJBFZf/ aZYS0zSdaaI7FPIolylJh+zcRsn8O4V6oxkz875t97BHiJfyD92s

thanks. so it appears that secure connections get intercepted and monitored in your network environment by using a certificate that is unknown and therefore untrusted by firefox.

you could try if the following steps can address the issue: enter about:config into the firefox address bar (confirm the info message in case it shows up). right-click somewhere on the page to create a new boolean preference - name it security.enterprise_roots.enabled and set its value to false. then restart firefox.

otherwise if this didn't help either you should get in contact with your it department about how to best resolve that...

Does the interception imply malware or some other security breach?

on the outset no, it's coming from the following issuer:

emailAddress              = soc@saa.senate.gov
commonName                = Senate Web Assurance Platform
organizationalUnitName    = Security Operations Center
organizationName          = U.S. Senate
localityName              = D.C.
stateOrProvinceName       = Washington
countryName               = US

The security.enterprise_roots.enabled boolean preference didn't work either. Thank you, though, for your help and for looking into it. I'll check with my IT people.

Andrew (-AT) from the @firefox Twitter, just following up to see if you've made any progress with your IT department.

Cheers!

Yeah, it was a backend issue on my network. Installing an additional certificate corrected the problem. Apparently other browsers install the necessary certificate automatically, but it has to be installed manually on Firefox sometimes.