How to Fix Firefox’s ‘SSL_Error_Bad_Mac_Alert’ Error?

How to Fix Firefox's'SSL_Error_Bad_Mac_Alert' Error?

Here we can see “SSL_Error_Bad_Mac_Alert’ Error”

The ‘ssl_error_bad_mac_alert ‘ occurs when users try to access specific secured websites using Mozilla Firefox. It occurs when sending emails to Gmail using IMAP.

Our research revealed that this issue arises when an SSL check fails, causing the browser to display an error and preventing users from visiting the site. In this situation, you can quickly fix the problem by adding the website to the list of Insecure FallBack Hosts in the advanced Firefox Preferences menu.

A network connection that blocks communications between your browser and external servers could also cause this browser behavior. By restarting your network, you can resolve this issue.

For example, an erroneous system-wide time and date could cause your browser to invalidate SSL certificates and display this warning. The issue was successfully resolved for several people who had the same issue by updating the Date and Time settings.

Unbeknownst to me, older computer configurations require a specific Firefox advanced setting to connect to SSL3 web servers without issues. On the Advanced Preferences tab, you can adjust the value of security to security.ssl3

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1. Adding Website to Insecure FallBack Hosts list

Your best bet is to visit your Mozilla Firefox config files and add the secure SSL website to the list of Insecure FallBack Hosts to prevent SSL_Error_Bad_Mac_Alert  error from occurring again.

Allows you to bypass the SSL check that was previously generating problems. The procedure worked for many individuals who had the issue for good.

To add the website to Firefox’s list of Insecure FallBack Hosts, please read the steps provided below.

  1. To access the Advanced Preferences menu in Mozilla Firefox, open the browser and type ‘about:config’ into the navigation bar.
  2. Then click Accept the Risk and Continue when prompted.
  3. In the Advanced Preferences menu, type security.tls.insecure fallback hosts and hit Enter.
  4. Then choose the security.tls.insecure fallback hosts entry to edit (right-hand section).
  5. Enter the website URL you’re having issues with within the newly arrived text field and press Enter.
  6. Restart Mozilla Firefox and see if the issue is resolved.

Suppose you’re still getting the security.tls.Keep reading about the insecure fallback host’s error or want a solution that won’t compromise your system’s security.

2. Restart the Router/Modem

However, a network discrepancy can cause this issue. Your network state may be in limbo, and a firewall may prevent your computer from communicating with external web servers.

If this is the case, rebooting your router should resolve the issue. NOT TO BE CONFUSED WITH RESETTING YOUR ROUTER Unlike a reset, this does not alter your existing credentials.

Then wait 30 seconds before pressing the ON/OFF button again. Disconnect the power cable from your power outlet to ensure a successful operation. When your router/modem reboots, your network will be reset.

Otherwise, move on to the next possible solution below.

3. Correcting Time & Date

Another reason why your Mozilla Firefox may lose security is due to a faulty update.

Date/time inconsistency causes security.tls.insecure_fallback_hosts error, As a result, your browser may have to break the connection due to the security certificate being

Assuming this is the case, you can resolve the issue by updating your date and time settings. The fix worked for several users who had the same issue.

  1. Press Windows key + R to open the Run dialogue box. Press Enter to open the date and time windows.
  2. Once inside the Date & Time box, click on the Date and Time tab and select Change date and time from the drop-down.
  3. Use the calendar supplied in the Date and Time window to set the dates and times you require.
  4. Restart your computer and visit the same website again to see whether the issue has been repaired.

To see if this repair works for you, read on.

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4. Setting Security.SSL3 to TRUE

It’s possible to obtain the ‘sl error bad mac alert’ error with genuine SSL web servers until you get to Advanced Preferences and select Security in Firefox’s Advanced Preferences.

This is because of Security.SSL3 is deactivated by default.

Security.SSL3 in Firefox can be enabled by following these steps:

  1. The Advanced Preferences menu is accessible by typing about:config into your Firefox browser.
  2. Click Accept Risk and Continue when prompted to ‘Proceed with Caution.
  3. Search for security in the Advanced Preferences menu’s top search bar.
  4. Enter the results of security.ssl3.
  5. To access security, scroll to the bottom of the screen and security.ssl3.
  6. You can choose between a string, boolean, or float.
  7. Next, check the security value.
  8. Save the changes and restart Firefox.
  9. Visit the same website that had the ‘ssl_error_bad_mac_alert‘ error and verify if it has been resolved.

User Questions


Pr_connect_reset_error occurs when Mozilla Firefox refuses an HTTPS request. Forcibly disconnecting a connection by the peer or a middlebox (usually a firewall)

Mozilla pkix error mitm detected

You see the error code SSEC_ERROR_UNKNOWN_ISSUER or MOZILLA_PKIX_ERROR_MITM_DETECTED. A certificate issued by a certificate authority unknown to Firefox and thus untrustworthy is displayed when you click the Advanced button on a “Warning: Potential Security Risk Ahead” message.

What is Pr_end_of_file_error?

It’s a common secure connection error in Firefox. Insecure connections occur when Firefox’s “cypher suites” fail to secure a site.

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How to fix SSL in Firefox

For Windows, use the “3-bar” option (or the Tools menu).

> Preferences > “3-bar” menu (or Firefox menu)

(Edit) > Preferences > “3-bar” menu.

Typing about:preferences into the address bar and pressing Enter/Return loads it.

Err empty response:

A website can return the err empty response error message when using the Chrome browser. Not sending/transmitting data Clear your browser’s cache, cookies, and temp files.