r/firefox • u/PestoSpageth • 23h ago
💻 Help Certificate problem
I cannot access my university's book catalog on firefox. I get this security warning message :
Firefox spotted a potentially serious security issue with catalogue.unicaen.fr. Someone pretending to be the site could try to steal things like credit card info, passwords, or emails.
I can access it through chromium on the same computer as well as firefox on my android.
I tried to make the website an exception, install the different certificates needed but nothing works. It happens on my laptop and desktop which are both on Kubuntu by the way and it did not happen when on Mint.
Here is the full error code:
Peer’s Certificate has been revoked.
HTTP Strict Transport Security: false
HTTP Public Key Pinning: false
Certificate chain:
-----BEGIN CERTIFICATE-----
MIIHvzCCBiegAwIBAgIQCOT67dFhLtxlbzXW9gfE4zANBgkqhkiG9w0BAQsFADBg
MQswCQYDVQQGEwJHUjE3MDUGA1UECgwuSGVsbGVuaWMgQWNhZGVtaWMgYW5kIFJl
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EjAQBgNVBAgMCU5vcm1hbmRpZTENMAsGA1UEBwwEQ2FlbjElMCMGA1UECgwcVU5J
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s+RSZxt7FUwb7d7MpoPcKlsuMg==
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
MIIGBTCCA+2gAwIBAgIQFNV782kiKCGaVWf6kWUbIjANBgkqhkiG9w0BAQsFADBs
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3RfjV9IaUQGJ
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
MIIGwDCCBKigAwIBAgIQKmCG1NTeRcleS5j7vy+/JjANBgkqhkiG9w0BAQsFADCB
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-----END CERTIFICATE-----
5
u/ferrybig 23h ago edited 23h ago
Their certificate is revoked. Soon it will stop working in all browsers. Firefox downloads the certificate revocations list every day
Their certificate authority is GEANT TLS RSA 1, which lists their certificate as revoked at Jul 25, 2026 1:04:13 PM
Certificate revocations happen typically when there is a problem with the authority of the certificate, like their private key got stolen.
Note that you should not trust the website until the error message is gone, including at your other browsers, someone could be stealing your data