Having Trouble Accessing HTTPS Sites with Firefox ? sec_error_cert_signature_algorithm_disabled or sec_error_unknown_issuer Firefox NetNanny Issues

When NetNanny runs, it monitors https: sites by presenting to the browser the NetNanny certificate instead of the website’s certificate. This may be misinterpreted by Firefox or other browsers (I have found the problem only with Firefox) as a bad certificate.

If you are getting an error stating “This Connection is Untrusted” and one of the above or other errors while NetNanny is active but not when NetNanny is disabled, then here’s the fix:

Import NetNanny Certificate into Firefox:

  1. Options->Advanced->Certificates->View Certificates

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  2. Click Import
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  3. Navigate to your Net Nanny Install Directory and select the “.PEM” file which should having a name something like “ContentWatch Trusted Root Authority.pem:

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  4. You should now have the Content Watch Certificate Installed (you may have to click on OK).
  5. Restart Firefox
  6. You should now be able to view any page with an https: link (default google.com page, gmail, etc.)

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