Many websites not loading in El Capitan

On the 30th of September 2021 the certificates that allow you to connect to various websites expired

you can however download new ones.

Click on the link below,

https://letsencrypt.org/certificates/

Download these two files

ISRG Root X1

Self Signed click on the der to download

And ISRG Root X2

Self signed click on der to download.

Open the Keychain Access app in your Applications> Utility folder.

In the left column highlight System.

Click on File in the menubar and click on Import Items,

select the newly downloaded files in turn and press Open.

Double-click on one of the newly imported certificates, click on the disclosure triangle

and next to When using this certificate: change Use System Defaults to Always Trust.

Do the same for the other certificate.

Restart your mac.

Thanks to Nikolai Franke for asking this question and Big Thanks to Eau Rouge from me too for fixing our problem!

Looks to have worked for me as well.

Saved my good ol' 2008 Mac and El Capitan's Safari and Chrome are now working!!

I hate the fact Apple makes it so difficult to keep a good but older working computer system working!

Thanks again!

God Bless You!!!!

-Audio Streams were not playing on our home music hub--very much a key to sanity thru this dreaded Covid era.

-Wish you and yours a most healthy and blessed 2022!!!

Thanks again!!!!!

Well, it seemed that the original certificate issue was blocking me from reaching that website... So I ended up logging in from my work computer, downloading files, emailing them to myself so I could download on the Macbook and then install. Seemed to work! Thanks for all the guidance everyone.

I was experiencing this problem as well, though it was beyond this in that some sites would load but wouldn't display correctly. Other technical experts could not find the problem, but this has completely solved the problem after several months of living with the issue. Many many thanks!

Thank you, my wife could not work any longer without having to do those extra steps. After applying the fix, it worked.

Make sure you reboot.

We really appreciate you supplying the fix,

THANK YOU !!!!

Thx so much!! Very clear explanation. Was struggling for the solution all over the internet.

Only Chrome gives me this error.... NET::ERR_CERT_DATE_INVALID

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OSX 10.11.16 El Capitan

MacPro5,1 Quad-Core Intel Xeon, 2,26 GHz, 48 GB

Well, I had to go through half-a-dozen steps, including getting a text message with a verification code, just to be able to log into Apple and write this response buuuuutt IT WORKED. I was SO tired of Chrome (and it was only Chrome, when I have Safari, Chrome and FireFox...) giving me that "YOU CAN'T NYAH NYAH NYAH BECAUSE IT'S NOT SAFE!!" message.

I upgraded to 10.11.6 on an older model iMac desktop. Chrome "updated" itself one late night while I slept and the next thing I knew I was banned from half the Internet because of its STUPID "This isn't SAFE!" ...even on some sites when I would try to go ahead and tell it to go to the site it would STILL return to the message "NOPE NOPE NOPE."

Now I can do anything on Chrome without a problem. THANK YOU, EAU ROUGE, SO MUCH!!! 7/12/2022

Thank you for proposing this solution: however it is not working for me & I wonder if you can offer an insight into why or an alternative solution.

I successfully get through all the steps described until importing into Keychain: this results in an error message "An error occurred. Unable to import "ISRG Root X1 (or X2). Error: -25294"

Any thoughts?

Regards

I followed the instructions but kept getting an error message when I tried to import downloaded .der files :

An Error occurred. Unable to import "ISRG Root X1"

Error:-25294

now soooo many sites not working on Safari, El Capitan

This just saved me from having a mental breakdown. THANK YOU!!!

Hi. I followed the steps but when I tried to open the downloaded files to import, I get an error message. Systems is unlocked. Any idea what went wrong?

Great suggestion!

It helped me to revitalize Safari in El Capitan.

Thanks.