PKI Tutorials - Herong's Tutorial Examples - Version 2.04, by Dr. Herong Yang
Adding Security Exception in Firefox 35
This section provides a tutorial example on how to add a security exception in Firefox 35 to continue visiting an HTTPS Web site with an un-trusted certificate.
What should you do when Firefox 35 tells you that "This Connection is Untrusted"? My suggestions is:
Here is what I did to add a security exception to pass the error page:
1. Open Firefox 35 to visit to https://login.yahoo.com again and wait for the error page.
2. Click the link "I Understand the Risks". Firefox 35 displays more warning messages:
If you understand what's going on, you can tell Firefox to start trusting this site's identification. Even if you trust the site, this error could mean that someone is tampering with your connection. Don't add an exception unless you know there's good reason why this site doesn't use trusted identification. [ Add Exception... ]
3. Click the "Add Exception" button. The "Add Security Exception" dialog box shows up:
4. Read messages on the dialog box carefully:
You are about to override how Firefox identifies this site. Legitimate banks, stores, and other public sites will not ask to do this. Server Location: https://login.yahoo.com/... Certificate Status - This site attempts to identify itself with invalid information. Unknown Identity - Certificate is not trusted, because it hasn't been verified by a recognized authority. [ ] Permanently store this exception
5. Click the "Confirm Security Exception" button. The Yahoo login page shows up.
I could continue to login to my Yahoo account and access my email box if I want to, because I can trust the Yahoo site.
Note that I left the "Permanently store this exception" checkbox unchecked, because I don't want Firefox to remember this exception. When I close Firefox and open it to visit https://login.yahoo.com, I want to see the error page again.
Last update: 2015.
Table of Contents
Introduction of PKI (Public Key Infrastructure)
Introduction of HTTPS (Hypertext Transfer Protocol Secure)
Using HTTPS with IE (Internet Explorer) 10
Visiting "https" Web Site with Firefox 35
Viewing Server Certificate in Firefox 35
Server Certificate General Information
Viewing Server Certificate Path in Firefox 35
Exporting Server Certificate to File in Firefox 35
Viewing Pre-Installed Certificates in Firefox 35
Listing of Trusted Root CA in Firefox 35
Exporting Certificate to File from Firefox 35
Deleting Root CA Certificates from Firefox 35
Firefox 35 Displaying Certificate Error Page
►Adding Security Exception in Firefox 35
Failing to Import Root CA Certificates to Firefox 35
Certificate Trust Settings in Firefox 35
Perl Scripts Communicating with HTTPS Servers
PHP Scripts Communicating with HTTPS Servers
Java Programs Communicating with HTTPS Servers
Certificate Stores and Certificate Console
.NET Programs Communicating with HTTPS Servers
CAcert.org - Root CA Offering Free Certificates
PKI CA Administration - Issuing Certificates
Digital Signature - Microsoft Word 2007
Digital Signature - OpenOffice.org 3