We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was archived. Please ask a new question if you need help.

Why do i get the error SSL_ERROR_BAD_MAC_ALERT / secure connection failed on various sites, but not all the time?

  • 1 reply
  • 1 has this problem
  • 1 view
  • Last reply by FredMcD

allan.cramer
allan.cramer
more options

I get the attached error seemingly randomly when i go to certain vendor webpages like automationdirect.com and seeedstudio.com. I can not find anything online as to why this might be happening. it is a work computer with ESET Endpoint security.

The try again button rarely works, i need to close firefox completely and reload the webpage to fix it.

I get the attached error seemingly randomly when i go to certain vendor webpages like automationdirect.com and seeedstudio.com. I can not find anything online as to why this might be happening. it is a work computer with ESET Endpoint security. The try again button rarely works, i need to close firefox completely and reload the webpage to fix it.
Attached screenshots

All Replies (1)

FredMcD
FredMcD
more options

There is security software like Avast, Kaspersky, BitDefender and ESET that intercept secure connection certificates and send their own.

https://support.mozilla.org/en-US/kb/firefox-cant-load-websites-other-browsers-can

https://support.mozilla.org/en-US/kb/firefox-and-other-browsers-cant-load-websites

https://support.mozilla.org/en-US/kb/secure-connection-failed-error-message

https://support.mozilla.org/en-US/kb/connection-untrusted-error-message

Websites don't load - troubleshoot and fix error messages

http://kb.mozillazine.org/Error_loading_websites

What do the security warning codes mean


SSL_ERROR_BAD_MAC_ALERT https://www.bing.com/search?q=SSL_ERROR_BAD_MAC_ALERT