DST Root CA X3 expired on Mac is an error that many Mac users have likely started seeing in their browser since the 30th of September. The DST Root CA X3 expired on Mac error prevents users from visiting sites that use Let’s Encrypt certificates.

Recently, many Mac users have started reporting the same problem with their browsers, namely, the appearance of an error message while trying to visit certain sites. The error message shown may vary – “DST Root CA X3 expired” is only one possible error message. Another one is “Your connection is not private” or “Attackers might be trying to steal your information”. Though the error/warning messages that get shown in the browser may differ, the underlying issue stays the same and that is the recent expiration of the widespread DST Root CA X3 certificate, created by the non-profit organization Let’s Encrypt. Many popular sites use this certificate and once it has expired, some (not all) users stopped being able to visit those sites.

There are a couple of solutions for users of older MACs. One is to stop using Safari or Chrome and download Firefox and use it as your default browser. You may also search for a fix for this issue to download and install the "root certificate" - this is something you may want to get a computer professional to do for you. Search for the phrase"DST Root CA X3 expired Mac". Please note we cannot verify the safety or security of any external website, so procedding with this is at your own riskand comes with no guarantees.

You can try installing Firefox as your browser, it does not use the MAC OS built-i root certificate.

The other option is to upgrade your MAC operation system, and if that is not possible, upgrade to a newer MAC.

Unfortunately this is not an issue that we can help with.