Matthew Adams
by Matthew Adams
Windows & Software Expert
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  • Firefox is a reliable browsing solution that scores higher than Chrome in certain areas, such as page download speed.
  • Mozilla revamped the browser in recent years, focusing on protecting users' privacy, allowing more customization options, and adding unique extensions.
  • Just like all the man-made things, Firefox may sometimes fail to open webpages. SEC ERROR OCSP FUTURE RESPONSE is one of the most common error codes affecting the browser. In this guide, we'll show you how to fix it.
  • Interested in more tips and tricks on how to improve your Windows 10 browsing experience? Check out our hub dedicated to browsers for more guides.

Some Firefox users have posted on the Mozilla forum about a SEC ERROR OCSP FUTURE RESPONSE error. That error can occur when users open webpages in Firefox.

The error message states:

An error occurred during a connection to. The OCSP response is not yet valid (contains a date in the future). Error code: SEC_ERROR_OCSP_FUTURE_RESPONSE.

Consequently, users can’t open website pages when Firefox displays that error message.


1. Update Firefox

  1. Open Firefox.
  2. Click Firefox’s Open menu button at the top right of its window.
  3. Click Help to open further menu options.
    The Help menu firefox error SEC_ERROR_OCSP_FUTURE_RESPONSE
  4. Select the About Firefox option to open the window in the snapshot directly below.About Firefox window firefox error SEC_ERROR_OCSP_FUTURE_RESPONSE
  5. Press the Restart to update Firefox button.

2. Check the time and date in Windows 10

  1. Click the system tray clock at the right of the taskbar to open the calendar shown directly below.Windows 10 calendar firefox error SEC_ERROR_OCSP_FUTURE_RESPONSE
  2. If the time and date don’t seem quite right, press the Windows key + S keyboard shortcut.
  3. Enter the keyword time in the search box.
  4. Click Change the date and time to open the Settings window as shown directly below.Date & time tab firefox error SEC_ERROR_OCSP_FUTURE_RESPONSE
  5. Turn on the Set the time automatically option.
  6. Restart your desktop or laptop.
    • If the Set the time automatically option was already selected and doesn’t change the time and date, turn that setting off.
  7. Click the Change button to manually adjust the time and date settings as required.Change date option firefox error SEC_ERROR_OCSP_FUTURE_RESPONSE
  8. Press the Change button, and restart Windows.

This error often arises when the Windows system clock time is ahead or behind your time zone’s actual time and date.

3. Turn off OCSP verification

  1. Launch Firefox
  2. Click Open menu and Options to open the tab in the shot shown directly below.
  3. Click Privacy and Security on the left of the tab.
  4. Then scroll down to the Query OCSP responder servers to confirm the current validity of certifications option.
    Query OCSP responder option firefox error SEC_ERROR_OCSP_FUTURE_RESPONSE
  5. Deselect the selected Query OCSP responder servers checkbox.
  6. Close and restart Firefox

Those are three resolutions that will probably fix the SEC_ERROR_OCSP_FUTURE_RESPONSE error for most Firefox users.

You might also need to replace your PC’s CMOS battery if the date and time keep changing in Windows.

You can do that by removing the old CMOS from the motherboard, but some users might prefer to hand their PCs to IT repair services to replace CMOS batteries.

By following these steps, you should be able to completely fix the SEC_ERROR_OCSP_FUTURE_RESPONSE error in Mozilla Firefox.

That being said, leave us a message in the comments section below, and tell us which of the above-mentioned methods worked best for you.

FAQ: Learn more about the SEC ERROR OCSP FUTURE RESPONSE error

  • What is OCSP?

OCSP is the abbreviation for Online Certificate Status Protocol which is an Internet protocol utilized for conveying certificate revocation information. The information is used for security purposes.

  • How does OCSP work?

This is how OCSP works: Firefox sends a request to the OCSP server run by the Certificate Authority requesting information about the website’s certification status. The server then responds to the browser’s request indicating whether the certificate is still valid or has already been revoked.

  • Does OCSP slow down browsing?

OCSP requests can slow down HTTPS connections. New certificates force the browser to make new requests which take more time to complete. If the browser cannot connect to the OCSP server of the Certificate Authority, it must either drop the connection or keep it. If the browser decides to continue the connection, this may pose serious security risks.

Editor’s Note: This post was originally published in March 2020 and has since been updated for freshness and accuracy.