Failing to Import Root CA Certificates to Firefox 35

This section provides a tutorial example on how to import a root CA certificate into Firefox 35. The import process failed with an error.

If I don't want to add a security exception to trust the Yahoo site when Firefox gives me the "This Connection is Untrusted" error, I need to fix the error.

Since I know why I am getting the "This Connection is Untrusted" error on the Yahoo login page, I can try to fix by importing the root CA certificate "VeriSign Class 3 Public Primary Certification Authority - G5" back into Firefox 35 from the certificate file I created earlier.

1. Run Firefox 35, and go to the "Tools" > "Options..." menu.

2. Click the "Advanced" icon, then click the "Encryption" tab.

3. Click the "View Certificates" button. The Certificate Manager dialog box shows up.

4. Click the "Authorities" tab since I want to import a CA (Certificate Authority) certificate.

5. Click the "Import" button. The "Select File containing CA certificate(s) to import" dialog box shows up.

6. Find and select \temp\VeriSign_Root_CA_pem.crt, which contains the "VeriSign Class 3 Public Primary Certification Authority - G5" certificate I created earlier.

7. Click the "Open" button to let Firefox import the certificate. Surprisingly, I got an error message box saying that "This certificate already installed as a certificate authority."

Why I am getting this error? I remember I deleted "VeriSign Class 3 Public Primary Certification Authority - G5" certificate from Firefox. Read the next section to find out the answer.

Last update: 2015.

Table of Contents

 About This Book

 Introduction of PKI (Public Key Infrastructure)

 Introduction of HTTPS (Hypertext Transfer Protocol Secure)

 Using HTTPS with IE (Internet Explorer) 10

 Using HTTPS with Chrome 40

Using HTTPS with Firefox 35

 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

 S/MIME and Email Security

 PKI (Public Key Infrastructure) Terminology

 Outdated Tutorials

 References

 PDF Printing Version