Firefox Secure Connection Failed: sec_error_ocsp_server_error

After Firefox 26, we often experience Secure Connection Failed error with Firefox when we are trying to connect to a HTTPS website, like


The error message says:

Secure Connection Failed

An error occurred during a connection to The OCSP server experienced an internal error. (Error code: sec_error_ocsp_server_error)

    The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.
    Please contact the website owners to inform them of this problem. Alternatively, use the command found in the help menu to report this broken site.

This usually happens when we have unstable Internet connection, or the remote server gets heavy traffic. In some rare cases, it means you are connecting to an insecure/ fraud website.

To solve this problem, uncheck the following setting in Firefox. This will somehow decrease secure level…

Secure Connection Failed with Firefox


  1. mentor   •  

    The OCSP connection, like standard HTTP connections, made by Firefox may be affected by addons, notably ad blockers.

    To verify the issue, take the normal path of disabling the addons, and then once the addon is identified, leave it enabled and disable the ad blocking subscriptions, to narrow the cause. *However*, each test must be run after a clean restart of Firefox, as OCSP responses are cached *including* server failures, and there is no way to clear the OCSP cache.

    If the failure is do to a broken ad blocker subscription, please then report the fact to the author.

    I have personally experienced this issue, had it fixed, and verified the fix.

  2. irakli   •  

    horrible advice!!!

  3. bbb   •  

    Sorry, but this is horrible advice. You shouldn’t leave that option unchecked.
    If you just reactivate it, after you deactivated it, the cache gets cleared and the problem is solved.

  4. Alcides   •  

    Thanks, this helps a lot

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