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Firefox is one of the most popular and reliable web browsers on the market. But there are some scenarios where Firefox is unable to open a website when it can all other browsers and computers. This is a common error that has been reported by many users. So, if you had SEC_ERROR_OCSP_INVALID_SIGNING_CERT error on Firefox, you are in the right place. Users have reported that they cannot access some Microsoft services, such as Bing or Outlook, because of this error. Although the same services were simultaneously accessible from a different browser, if you are faced with such a problem, you can follow the steps described in this post to fix it.

An error occurred when connecting to Invalid OCSP signature certificate in the OCSP response. Error code: SEC_ERROR_OCSP_INVALID_SIGNING_CERT

The error is roughly translated as “The certificate with which you access a website or web page is invalid or has been invalidated”. The certificate may have been correct at one time, but it is now invalid. An appropriate technical term for this process is OCSP Stapling.

Disable OCSP transfer

Try to temporarily disable OCSP tacking by setting this preference to false on the about:config page to see if it has an effect.

security.ssl.enable_ocsp_stapling = false

You can open the about:config page from the location/address line. You can accept the warning and click on “I accept the risk” to continue.

It is best to right-click on the context menu to reset this preference to true once you have finished accessing an affected website, as this is a security feature. Note that an OCSP connection (just like an HTTP connection) can be affected by add-ons and ad blockers. If the error is still not corrected or if you meet someone else, try to disable any active add-on and then systematically reactivate it until you discover the perpetrator.

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Disabling OCSP stacking may also affect the functionality of other websites you visit, provided they use the security feature.

Setting the correct date and time


Many users reported that the error message was fixed and that they could access the site normally after changing the date and time settings to the current values.

If your date and time settings are significantly outdated, the web server you are trying to access will refuse the connection for security reasons. This ensures that you have the correct date and time settings:

  1. Press Windows + R to open a Run dialog box. Then type “timedate.cpl” and press Enter to open the Date and Time window.
  2. In the Date and Time window, go to the Date and Time window and click Change Date and Time.
  3. In the Date and Time Settings window, use the calendar under Date and Time to set the appropriate values for your time zone.
  4. Restart your computer and visit the website again the next time you start to see if the problem is solved.

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