Firefox: How to handle invalid security certificates ?

When accessing for the first time Community Single Sign-On (CSSO) enabled web sites like

depending of the version installed, the Firefox browser will certainly present you one of the following messages.

  • Firefox 3.5

  • Firefox 3.0

If you want to avoid these messages in the future, the following instructions will prevent Firefox from raising those messages.

Firefox 3.5

  • Click on the link I Understand the Risks

  • Push the button Add Exception

  • The certificate presented by the server will automatically be downloaded from the server
  • Push the button View

Go ahead to the instructions given at All versions.

Firefox 3.0

  • Click on the link "Or you can add an exception"

  • Push the button Add Exception

  • Push the button Get Certificate to get the certificate presented by the server

  • Push the button View to inspect the presented certificate

Go ahead to the instructions given at All versions

All versions

  • In a second browser window, open the EDIT WP 5.7 Certification Authority page and look for the SHA-1 and/or MD5 fingerprint of the server you currently wanted to access (e.g. idp.e-taxonomy.eu)

  • Back to the Certificate Viewer dialog of Firefox, look for the SHA-1 and MD5 fingerprints below the Fingerprint header
  • Compare these values whith those found on the EDIT WP 5.7 Certification Authority page
  • Push the button Close

Note: Proceed only, if the fingerprints are identical. Otherwise, inform the EDIT Support Team immediately !

  • Verify, that the radio button Permanently store this exception is selected, if you don't want to be alerted for this server anymore
  • Push the button Confirm Security Exception

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