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How to Resolve Firefox Error ‘SSL_Error_Bad_Mac_Alert’

Search: security.tls.insecure_fallback_hosts

The ‘ssl_error_bad_mac_alert‘ error typically occurs in Mozilla Firefox when affected users attempt to visit certain secured websites. In some cases, the error appears when the user attempts to send emails via the IMAP interface to Gmail.

We have analysed several user reports to find potential causes – as it turns out, this issue can occur due to the fact that a certain SSL check is failing, forcing the browser to throw this error and restrict the user from accessing the website. In this case, you can resolve the issue easily by accessing the advanced Firefox Preference menu and adding the website to the list of Insecure FallBack Hosts.

Another potential cause that might lead to this browser behavior is a network connection that ends up blocking communications between your browser and external servers. In this case, you can fix the issue by performing a power-cycling procedure on your router or modem, forcing your network to start fresh.

One scenario that might force your browser to invalidate SSL certificates and throw this error, as a result, is an incorrect system-wide time & date. Several users encountering the same problem have reported that they finally managed to resolve the issue after they accessed the Date and Time settings and updated the values accordingly.

It turns out that certain older machine configurations will need a certain Firefox advanced setting advanced in order to be able to connect to SSL3 web-servers without errors. If this scenario is applicable, you can fix the issue by accessing the Advanced Preferences tab and setting the value of security.ssl3 to True.

This tutorial will apply for computers, laptops, desktops, and tablets running the Windows 10, Windows 8/8.1, Windows 7 operating systems. Works for all major computer manufactures (Dell, HP, Acer, Asus, Toshiba, Lenovo, Samsung).