However, if your Mac is still running El Capitan (macOS 10.11) or an older version of macOS, then you have probably started encountering various issues in your browsers that prevent you from reaching the sites you want to visit. Macs that have macOS 10.12.1 or later should have no problems with the expiration of this certificate. The factor that separates Macs that can and Macs that cannot visit those such sites is the macOS version that each machine has. Many popular sites use this certificate and once it has expired, some (not all) users stopped being able to visit those sites. 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. Another one is “ Your connection is not private” or “ Attackers might be trying to steal your information”. The error message shown may vary – “ DST Root CA X3 expired” is only one possible error message. 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 DST Root CA X3 expired on Mac error prevents users from visiting sites that use Let’s Encrypt certificates. Manually installing the ISGR Root X1 certificateĭST 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.I'd appreciate any help from somebody familiar with this issue. Only with Firefox.įinally, if the pages do not contain any file that exceeds the 23 kb or if they are hosted on a remote server the page loads correctly. On the contrary, the same website on a local server and with other browsers does not have the error. When I inserted a file of more than 23 kb (either a jpg, css or js), after reloading the page, I immediately lost the internet connection. To verify the cause of this issue, I started a website from scratch. I installed the version for developers and I have the same problem again. I've uninstalled and installed Firefox deleting all files and the error appears again. I turned off the firewall and antivirus, and the error continues. These are the tests I did where the problem persists: I tested with other operating systems (Windows 10, Vista, MAC OS X 10.6) and there was no problem. The same page on a remote server works fine. These are the tests I did where the problem disappears: To get to this error I've tried other browsers, and other operating systems, even with the same browser on Mac OS X 10.6 and there is no problem (in pages hosted on MAMP) I've looked into the console.app and there aren't any error logs registered. Every time I download a page, if a file has more than 23 kb approximately (either css, jpg, png or js) I lose the internet connection. The pages are hosted on a local server (MAMP). Operating System: OSX El Capitán version 10.11.2 Whenever I load a page, I lose my internet connection when the website has linked files larger than 23 kb in local test sites. I'm having an issue with Firefox and MAC OS X El Capitan.
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