If you click on the "technical details" section, what do you see?

praveen_mummasani said

Hi Team, I am unable to browse Gmail from past 2 days,initially i thought it was error only in my system,but i am seeing same error for my friends also while accessing gmail from firefox. I am able to access gmail in other browsers and below is the error.Attached screenshot also and i did not changed any security settings. " This Connection is Untrusted You have asked Firefox to connect securely to mail.google.com, but we can't confirm that your connection is secure. Normally, when you try to connect securely, sites will present trusted identification to prove that you are going to the right place. However, this site's identity can't be verified. What Should I Do? If you usually connect to this site without problems, this error could mean that someone is trying to impersonate the site, and you shouldn't continue. This site uses HTTP Strict Transport Security (HSTS) to specify that Firefox only connect to it securely. As a result, it is not possible to add an exception for this certificate."

user293 said

If you click on the "technical details" section, what do you see?

I am able to see below Error Message "

mail.google.com uses an invalid security certificate.

The certificate is not trusted because the issuer certificate is unknown.

(Error code: sec_error_unknown_issuer)"

Thanks Praveen

Open this chrome URI by pasting or typing this URI in the location/address bar to open the "Add Security Exception" window and check the certificate:

• chrome://pippki/content/exceptionDialog.xul

In the location field type/paste the URL of the website

• retrieve the certificate via the "Get certificate" button
• click the "View..." button to inspect the certificate in the Certificate Viewer

Check who is the issuer of the certificate.

You can inspect more details like the certificate chain in Details tab of the Certificate Viewer.