Access Keys:
Skip to content (Access Key - 0)

Firefox - Resolve Certificate Issues to Access Atlas

On this page:


This page will guide you through resolving certificate issues in Firefox so you can access Atlas.
Test your certificate

You'll need to:

  1. Make sure that you have a valid personal certificate
  2. Delete any expired or duplicate certificates. NOTE: [Verify that you are not using your certificate to encrypt email].
  3. Empty your browser cache

Be sure to complete all of these steps!

Install the Personal Certificate

  1. Navigate, in Firefox, to
  2. Enter your Kerberos username and password, and your MIT identification number, and click Next.
    Identification page

  3. On the page Generate a Private Key, leave the Key Size at the highest grade for your browser. The Certificate Lifetime gives the default number of days until this personal certificate expires. Click Next to accept the defaults.
    Result: The message "Key Generation in progress ..." appears.
    Certificate life screen

  4. An Alert message confirms that the certificate has been installed, and instructs the user to backup the personal certificate.
    Alert message

    Note: It is not necessary to backup your personal certificate. If you do wish to backup your personal certificates locally, in Firefox go to Preferences/Options > Advanced > View Certificates, click Backup All, and follow the instructions.
  5. Your certificate is now installed.

  6. If this is your first time installing certs on Firefox, you also need to install the MIT Certificate Authority. The web installer will prompt you to install it by clicking a link.
    MIT CA
    From here, choose MIT to "trust this CA to identify websites"
    Trust this CA
    And you are good to go.

Delete Expired and Duplicate Certificates

  1. Open Firefox Preferences
    1. Open Preferences from the 3 bars in the upper right.
      firefox preferences

    2. Open Preferences from menu path:
      • On Windows: Tools > Options (or Firefox > Options)
      • On Linux: Edit > Preferences
      • On Mac OS X: Firefox > Preferences

  2. Select the Advanced pane. Then select the Certificates tab.
    firefox prefereences

  3. From Your Certificates, click View Certificates.
    firefox preferences

  4. Select the expired or duplicate certificate and click the Delete button. You will be prompted if you want to delete the certificate. Click OK to continue.
    firefox preferences

  5. Close and re-open Firefox, and confirm that you have one, non-expired certificate.

Empty your Browser Cache

The page How do I clear the browser cache in Firefox? does not exist.

Install the MIT Certificate Authority (CA)

Note: The MIT CA is not needed for Open Enrollment, but is needed for many other MIT certificate-protected sites. Take a moment now to install the MIT CA in Firefox.

  1. If you are viewing this page in Firefox, select here to download the MIT CA (Certificate Authority).
    Alternatively, copy and paste the following URL into Firefox:
  2. Click to check the box Trust this CA to identify web sites.
    'Do You Want to Trust...'

  3. For details on the CA, click the View button. The following window appears.

    General tab

  4. Confirm that the CA is from MIT, and that it expires in 2026. Click Close.
  5. In the "You have been asked ..." box, click OK.

IS&T Contributions

Documentation and information provided by IS&T staff members

Last Modified:

February 25, 2016

Get Help

Request help
from the Help Desk
Report a security incident
to the Security Team
c-firefox-certs c-firefox-certs Delete
firefox firefox Delete
certificate certificate Delete
issues issues Delete
Enter labels to add to this page:
Please wait 
Looking for a label? Just start typing.
This product/service is:
Easy to use
Difficult to use

This article is:
Adaptavist Theme Builder (4.2.3) Powered by Atlassian Confluence 3.5.13, the Enterprise Wiki