MOZILLA_PKIX_ERROR_REQUIRED_TLS_FEATURE_MISSING

  • Resolved unraveledza

    (@unraveledza)


    2 years, 8 months ago

    I get the following error when accessing my site on Firefox: MOZILLA_PKIX_ERROR_REQUIRED_TLS_FEATURE_MISSING

    I have attempted to reinstall a certificate using really simple ssl, but when I get to the installation part I get the following error:

    “Something went wrong. Could not load field installation”

    I need to access the installation portion to add the cert on the server.

Viewing 1 replies (of 1 total)
  • Plugin Support Jarno Vos

    (@jarnovos)

    2 years, 8 months ago

    Hi @unraveledza,

    Please update Really Simple SSL to the latest available version (7.1.3) to resolve the “Something went wrong” errors in the Let’s Encrypt Wizard.

    As for the Firefox error, this is related to OCSP stapling. Your SSL certificate likely has the “must staple” TLS extension enabled (you can toggle this when generating an SSL certificate in Really Simple SSL).

    And this requires OCSP stapling to be available on your webserver, which doesn’t appear to be the case for you. Firefox (and other browsers) will reject the connection if the certificate requires OCSP stapling, but when the webserver does not staple an OCSP response.

    Therefore you can either:

    • Enable OCSP stapling on your webserver (you could contact your Hosting Provider for assistance with that)
    • Generate a new SSL certificate without the “must staple” extension enabled

    Hope it helps! Kind regards, Jarno

Viewing 1 replies (of 1 total)

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