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I am routing a Linux machine through a SOCKS5 proxy. The internet works as expected and I am presented with the proxy's IP when viewing http://whatismyip.com.

However, some sites are reporting that I am experiencing a MITM attack:

Software is Preventing Firefox From Safely Connecting to This Site

www.mozilla.org is most likely a safe site, but a secure connection could not be established. This issue is caused by DigiCert Global Root CA, which is either software on your computer or your network.

What can you do about it?

www.mozilla.org has a security policy called HTTP Strict Transport Security (HSTS), which means that Firefox can only connect to it securely. You can’t add an exception to visit this site.

If your antivirus software includes a feature that scans encrypted connections (often called “web scanning” or “https scanning”), you can disable that feature. If that doesn’t work, you can remove and reinstall the antivirus software.

  • If you are on a corporate network, you can contact your IT department.

  • If you are not familiar with DigiCert Global Root CA, then this could be an attack, and there is nothing you can do to access the site.

https://www.mozilla.org/firefox/new/?utm_medium=referral&utm_source=support.mozilla.org

Your connection is being intercepted by a TLS proxy. Uninstall it if possible or configure your device to trust its root certificate.

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

Certificate chain:

-----BEGIN CERTIFICATE-----
MIIGRjCCBS6gAwIBAgIQDJduPkI49CDWPd+G7+u6kDANBgkqhkiG9w0BAQsFADBN
MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMScwJQYDVQQDEx5E
aWdpQ2VydCBTSEEyIFNlY3VyZSBTZXJ2ZXIgQ0EwHhcNMTgxMTA1MDAwMDAwWhcN
MTkxMTEzMTIwMDAwWjCBgzELMAkGA1UEBhMCVVMxEzARBgNVBAgTCkNhbGlmb3Ju
aWExFjAUBgNVBAcTDU1vdW50YWluIFZpZXcxHDAaBgNVBAoTE01vemlsbGEgQ29y
cG9yYXRpb24xDzANBgNVBAsTBldlYk9wczEYMBYGA1UEAxMPd3d3Lm1vemlsbGEu
b3JnMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAuKruymkkmkqCJh7Q
jmXlUOBcLFRyw5LG/vUUWVrsxC2gsbR8WJq+cYoYBpoNVStKrO4U2rBh1GEbccvT
6qKOQI+pjjDxx9cmRdubGTGp8L0MF1ohVvhIvYLumOEoRDDPU4PvGJjGhek/ojve
dPWe8dhciHkxOC2qPFZvVFMwg1/o/b80147BwZQmzB18mnHsmcyKlpsCN8pxw86u
ao9Iun8gZQrsllW64rTZlRR56pHdAcuGAoZjYZxwS9Z+lvrSjEgrddemWyGGalqy
Fp1rXlVM1Tf4/IYWAQXTgTUN303u3xMjss7QK7eUDsACRxiWPLW9XQDd1c+yvaYJ
KzgJ2wIDAQABo4IC6TCCAuUwHwYDVR0jBBgwFoAUD4BhHIIxYdUvKOeNRji0LOHG
2eIwHQYDVR0OBBYEFNpSvSGcN2VT/B9TdQ8eXwebo60/MCcGA1UdEQQgMB6CD3d3
dy5tb3ppbGxhLm9yZ4ILbW96aWxsYS5vcmcwDgYDVR0PAQH/BAQDAgWgMB0GA1Ud
JQQWMBQGCCsGAQUFBwMBBggrBgEFBQcDAjBrBgNVHR8EZDBiMC+gLaArhilodHRw
Oi8vY3JsMy5kaWdpY2VydC5jb20vc3NjYS1zaGEyLWc2LmNybDAvoC2gK4YpaHR0
cDovL2NybDQuZGlnaWNlcnQuY29tL3NzY2Etc2hhMi1nNi5jcmwwTAYDVR0gBEUw
QzA3BglghkgBhv1sAQEwKjAoBggrBgEFBQcCARYcaHR0cHM6Ly93d3cuZGlnaWNl
cnQuY29tL0NQUzAIBgZngQwBAgIwfAYIKwYBBQUHAQEEcDBuMCQGCCsGAQUFBzAB
hhhodHRwOi8vb2NzcC5kaWdpY2VydC5jb20wRgYIKwYBBQUHMAKGOmh0dHA6Ly9j
YWNlcnRzLmRpZ2ljZXJ0LmNvbS9EaWdpQ2VydFNIQTJTZWN1cmVTZXJ2ZXJDQS5j
cnQwDAYDVR0TAQH/BAIwADCCAQIGCisGAQQB1nkCBAIEgfMEgfAA7gB1AKS5CZC0
GFgUh7sTosxncAo8NZgE+RvfuON3zQ7IDdwQAAABZuYWiHwAAAQDAEYwRAIgZnMS
H1JdG6NASHWTwD0mlP/zbr0hzP263c02Ym0DU64CIEe4QHJDP47j0b6oTFu6RrZz
1NQ9cq8Az1KnMKRuaFAlAHUAh3W/51l8+IxDmV+9827/Vo1HVjb/SrVgwbTq/16g
gw8AAAFm5haJAgAABAMARjBEAiAxGLXkUaOAkZhXNeNR3pWyahZeKmSaMXadgu18
SfK1ZAIgKtwu5eGxK76rgaszLCZ9edBIjuU0DKorzPUuxUXFY0QwDQYJKoZIhvcN
AQELBQADggEBAKLJAFO3wuaP5MM/ed1lhk5Uc2aDokhcM7XyvdhEKSHbgPhcgMoT
9YIVoPa70gNC6KHcwoXu0g8wt7X6Vm1ql/68G5q844kFuC6JPl4LVT9mciD+VW6b
HUSXD9xifL9DqdJ0Ic0SllTlM+oq5aAeOxUQGXhXIqj6fSQv9fQN6mXxQIoc/gjx
teskq/Vl8YmY1FIZP9Bh7g27kxZ9GAAGQtjTL03RzKAuSg6yeImYVdQWasc7UPnB
XlRAzZ8+OJThUbzK16a2CI3Rg4agKSJk+uA47h1/ImmngpFLRb/MvRX6H1oWcUuy
H6O7PZdl0YpwTpw1THIuqCGl/wpPgyQgcTM=
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
MIIElDCCA3ygAwIBAgIQAf2j627KdciIQ4tyS8+8kTANBgkqhkiG9w0BAQsFADBh
MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3
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ANyuWJBNwcQwFZA1W248ghX1LFy949v/cUP6ZCWA1O4Yok3wZtAKc24RmDYXZK83
nf36QYSvx6+M/hpzTc8zl5CilodTgyu5pnVILR1WN3vaMTIa16yrBvSqXUu3R0bd
KpPDkC55gIDvEwRqFDu1m5K+wgdlTvza/P96rtxcflUxDOg5B6TXvi/TC2rSsd9f
/ld0Uzs1gN2ujkSYs58O09rg1/RrKatEp0tYhG2SS4HD2nOLEpdIkARFdRrdNzGX
kujNVA075ME/OV4uuPNcfhCOhkEAjUVmR7ChZc6gqikJTvOX6+guqw9ypzAO+sf0
/RR3w6RbKFfCs/mC/bdFWJsCAwEAAaOCAVowggFWMBIGA1UdEwEB/wQIMAYBAf8C
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QS5jcmwwPQYDVR0gBDYwNDAyBgRVHSAAMCowKAYIKwYBBQUHAgEWHGh0dHBzOi8v
d3d3LmRpZ2ljZXJ0LmNvbS9DUFMwHQYDVR0OBBYEFA+AYRyCMWHVLyjnjUY4tCzh
xtniMB8GA1UdIwQYMBaAFAPeUDVW0Uy7ZvCj4hsbw5eyPdFVMA0GCSqGSIb3DQEB
CwUAA4IBAQAjPt9L0jFCpbZ+QlwaRMxp0Wi0XUvgBCFsS+JtzLHgl4+mUwnNqipl
5TlPHoOlblyYoiQm5vuh7ZPHLgLGTUq/sELfeNqzqPlt/yGFUzZgTHbO7Djc1lGA
8MXW5dRNJ2Srm8c+cftIl7gzbckTB+6WohsYFfZcTEDts8Ls/3HB40f/1LkAtDdC
2iDJ6m6K7hQGrn2iWZiIqBtvLfTyyRRfJs8sjX7tN8Cp1Tm5gr8ZDOo0rwAhaPit
c+LJMto4JQtV05od8GiG7S5BNO98pVAdvzr508EIDObtHopYJeS4d60tbvVS3bR0
j6tJLp07kzQoH3jOlOrHvdPJbRzeXDLz
-----END CERTIFICATE-----

How do I alleviate this error so that I can access these sites? Do I need to accept some certificate on my local machine or on the proxy?

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2 Answers 2

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I have had this off-and-on for a few days (I'm running Fedora 31 beta for a couple weeks) and starting to cause issues with some of the sites I visit.

Since Firefox has it's own list of certificates, I could verify it was not a network issue by pulling up Chrome/Chromium and view the pages.

I was able to un-install then re-install Firefox and that has solved the problem for me.

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  • 1
    An easier fix is to go into about:config in Firefox and change the security.enterprise_roots.enabled option from TRUE to FALSE.
    – luisdev
    Commented Dec 2, 2020 at 13:37
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You have to download and import the ca-file of your proxy in your machine. On Debian/Ubuntu

  • a pem coded file under /usr/local/share/ca-certificates/
  • import via "update-ca-certificates"

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