How to Fix `SSL_Error_Bad_Mac_Alert` in Firefox

So, there is this annoying error message that keeps appearing in Firefox when I use it. I’ve checked with my IT guys, and they know nothing about it. So, I’ve started googling and I’ve found that this error is a known problem in Firefox, and it really should be fixed. It seems that this has been raised before, and a few users have suggested solutions to this problem, but none of those solutions seem to actually work. I’ve just done a quick Google and they seem to be working for some other users.

SSL_ERROR_BAD_MAC_ALERT is an error code that is displayed by Mozilla Firefox when the browser encounters a problem using the Secure Sockets Layer (SSL) protocol. The code is generated by the server if the client’s certificate can’t be verified.

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When visiting websites in Mozilla Firefox, you may encounter errors such as SSL_ERROR_BAD_MAC_ALERT. This problem is more common on Mac computers and less common on Windows 10 PCs. When users try to access secure websites with security certificate issues, an error is displayed. An error message is displayed:

The establishment of a secure connection has failed.
An error occurred while connecting to example.com. The SSL host reports an invalid message authentication code. Error Code : SSL_ERROR_BAD_MAC_ALERT
The page you are trying to access cannot be displayed because the authenticity of the data received cannot be verified.
Please contact the administrators of the website to inform them of this problem.

What causes the Firefox error `SSL_Error_Bad_Mac_Alert`?

There can be several reasons for an error in the Firefox browser.

  • This could be an SSL validation issue that is not working or an issue with the SSL site certificate.
  • Your Firefox browser may be having problems and needs to be restarted or updated.

Whatever the cause of the Firefox error, there are solutions you can try to fix the problem and make it go away.

How to fix the SSL_Error_Bad_Mac_Alert error in Firefox?

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Back to previous version

If the error occurs after upgrading to the latest version of the Windows operating system, try going back to the previous version.

  1. Press the Start button and select Settings.
  2. Click on Updates and Security.
  3. Select the Restore tab.
  4. Under Return to a previous version of Windows 10, click the Start button.
  5. Follow the on-screen instructions to install the previous version.

The Revert to previous version of Windows 10 option is only available for 10 days after installing the update. If the Start button is grayed out, you will need to create a boot disk with an ISO file from a previous version of Windows, and then perform an upgrade/reinstall using the boot disk.

Web browser removal

  1. Press Windows + R to open Run.
  2. Enter the check and press OK.
  3. In the Control Panel, go to Programs -> Programs and Features.
  4. Select Web Browser and click Remove.
  5. Press Yes when asked to confirm the action.
  6. Wait until the browser is deleted.
  7. Then reinstall the latest version of the web browser and check if the error is fixed.

Disable browser add-ons

  1. In Firefox, click Menu.
  2. Under Preferences, select Add-ons. You can also open it by pressing the key combination Ctrl + Shift + A.
  3. Click on the Extensions icon in the left pane.
  4. Disable all extensions one by one.
  5. Restart your browser and try to access the website.
  6. If the problem persists, you may need to reinstall your browser.

Check the security filters of your ISP

  1. This error may occur if your ISP has enabled a security filter.
  2. If your Internet service provider has enabled a security filter, ask them to disable it.
  3. You can also disable it by logging into your account’s control panel.
  4. If you don’t remember asking your ISP to enable web filtering, make sure it’s enabled under Account Management.
  5. Many ISPs include security filters by default during installation.

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frequently asked questions

To resolve this issue, check the settings of the security software you are using and look for the SSL scanning feature. If you find it, uncheck the box that indicates whether it is enabled. Once you have disabled this feature in your security software, try visiting the site again.

  1. On the error page, click Where to add an exception.
  2. Click the Add Exception button.
  3. Click on Retrieve Certificate.
  4. Click View to display a window describing the z/OSMF site problem.
  5. Close the dialog box after you have verified the certificate.
  6. Click on Confirm Security Exception to trust the z/OSMF site.

The `ssl_error_bad_mac_alert` error usually occurs in Mozilla Firefox when affected users try to visit certain secure websites. One of the scenarios that can cause a browser to invalidate SSL certificates and cause this error is an incorrect time and date on the system.

An incorrect system date may cause Firefox to detect that the site’s security certificate is expired or invalid. Make sure your computer is set to the correct date, time and time zone. For more information, see Resolving time-based errors on secure websites.

Frequently Asked Questions

What is error code Ssl_error_bad_mac_alert?

This error code is returned by the server if the MAC address of the client is unknown or the MAC address is not in the server’s list of authorized MAC addresses.

How do I fix secure connection failed in Firefox?

In Firefox, go to the address bar and type about:config. Search for network.http.keep-alive. Set the value to true.

How do I fix certificate errors in Firefox?

If you’re getting certificate errors in Firefox, you may need to update your certificate. You may be able to fix the errors by following these steps: Click the menu button Options . Preferences . Advanced . Certificates . Click the Authorities tab. Click the Import button. If you’re still getting certificate errors, you may need to update your certificate.

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