iCloud login problem on Sierra, High Sierra? Try this.

I can confirm this, did the same and unchecked all the expired certificates after installing the latest AppleISTCAG1 and everything is working fine!

Thanks to Pedrocaiano for pointing me here. I was skeptical because I could long in to iCloud using Safari on the MBP but not to iCloud. Any way I downloaded the certificate and hey presto I can connect to iCloud. After three days I was on the point of doing a clean install of OSX.

pedrocaiano wrote:

So the dreaded day has come, the certificate has expired (as announced previously) and I'm right back to where I started.

iCloud has stoped working again.

SOLUTION: Open Keychain Access, Double click on the Apple IST CA 2 - G1 Certificate, Expand Trust option, When using this certificate: Select "Always Trust".

Restart the Mac.

Done!

this doesn't work for me, for example "cloud drive" doesn't sync on my Macbook Pro with High Sierra !

I think we need a renewed certificate from here Apple PKI - Apple

FYI, issues on my iPad 4 running iOS 10 were fixed by this intermediate cert. Messages and iCloud working again.

Great!

It worked on my old MBP early 2011 on Sierra and also on an old iPad 4th Gen iOS 10.3.3.

Again, I don’t know if it will fail on May?

Hey Guys, Apple just released their own new Apple IST CA 2 - G1 certificate in the PKI- Site, it also expires 20250507 but is different from the other ones it installs in the system column, just installed it and everything keeps working... Just going to leave everything as is (like in dgd's post) since it's working...

So I did this....

I went into all certificates listed in a couple of my earlier posts that I'd set trust to "always" . I set them back to "System".

Rebooted (don't know if necessary but why not).

So far all working fine.

THANK YOU!!!! You have done what 24 hours of contacting Apple Support didn't do... This is the solution!! They wanted me to reinstall MacOS and that would have been a pain is the ***...

Thanks! That fixed! However, I noticed that the intermediate cert expires on May 20, 2022...I assume we'll need to update again?

Regards, Patrick

I found that I need both certificates for it to work.

iCloud drive sync's fine that way, and so does everything else works as supposed to

Again, thanks. I had it set to show expired on my main laptop, but didn't realize it wasn't on the Sierra one (and forgot about that). I just did that, and now see it again, as well as am choosing to Always Trust. I guess I was lucky so far.

My iMac Runs on 10.13.6 so updating to the last High Sierra version will not solve the problem.

Glad I found that "other" certificate to extend iCloud use on my iMac until 2025, although I know it's obsolete it still does everything I need it to do. It's not only iCloud Sync and Notes that uses this certificate, iMessages, FaceTime, My Photo Stream, iCal, Contacts etc... all those things are linked to this certificate and stop syncing across devices.

It's unfortunate that we are left to our own devices to sort this out...

Yes, I'm on High Sierra. It's a login certificate btw, I don't have a Macrumors account so I can't comment...

Everything i still working for me.

Yes, it works !