My Firefox 15.0.1 cannot verify any SSL CA, it says:"Cound not verify this certificate for unknown reasons." when I view the certificate status.
I recently switched to Windows 8 (from 7) and installed Firefox 15.0.1. Whenever I try to access a http secure page I get a message that "This Connection is Untrusted". If I click the Add exception button and view the certificate status I get the following message every time: "Cound not verify this certificate for unknown reasons."
I checked these sites in other browsers and they work just fine. I also checked the certificates using this site: http://www.networking4all.com/en/support/tools/site+check/
I've alreary tried to run firefox in compatibility mode and when that didn't help I reinstalled it but nothing's changed. I'm using chrome for the time being but I hope it's not the only solution.
Solution choisie
Which security software (firewall, anti-virus) do you have?
Some firewalls monitor secure (https) connections and send their own certificate instead of the website's certificate.
You can retrieve the certificate and check details like who issued certificates and expiration dates of certificates.
- Click the link at the bottom of the error page: "I Understand the Risks"
Let Firefox retrieve the certificate: "Add Exception" -> "Get Certificate".
- Click the "View..." button and inspect the certificate and check who is the issuer.
You can see more Details like intermediate certificates that are used in the Details pane.
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Make sure SSL protocols are selected in firefox.
Go to Tools-->Options-->Advanced-->Encryption
Under protocols make sure both SSL and TLS are checked.
Modifié le par ErikaV
Thanks for the answer, but both SSL 3 and TLS 1 are checked.
Solution choisie
Which security software (firewall, anti-virus) do you have?
Some firewalls monitor secure (https) connections and send their own certificate instead of the website's certificate.
You can retrieve the certificate and check details like who issued certificates and expiration dates of certificates.
- Click the link at the bottom of the error page: "I Understand the Risks"
Let Firefox retrieve the certificate: "Add Exception" -> "Get Certificate".
- Click the "View..." button and inspect the certificate and check who is the issuer.
You can see more Details like intermediate certificates that are used in the Details pane.
Thanks cor-el, you were totally right. I don't know how I didn't noticed that the certificate issuer was ESET in all cases. I refined my google search with this and found the same issue and the solution which was also provided by you. (https://support.mozilla.org/en-US/questions/923516)
So I turned off the SSL protocol filtering in ESET and the problem disappeared.