Apple ID on El Capitan does not work at all

I tried both solutions here. The solution by means of Terminal function worked first time when upgrading to El Capitan, but today had again the same problem that any application that requires signing to iCloud accounts (I Tunes, FaceTime) gets hung in signing in process and then have no otters option by to force shut the computer to close that application. I tried signing through the internet options proposed and the computer is hung signing in again. I don't understand why the heck an operating system upgrade should create such problems. I bought Apple computer and products precisely because they advertise a close system avoids all this crap.....

Thank you! This worked great. Ends much frustration for me.

Thank you! I was able to login to my appleID online, in iTunes and App Store on my iPhone and MacbookPro but not my iMac with El Capitan on it. After hours of combing though threads and trying everything in the world, except for maybe squeezing goat testicles while chanting incantations around a smoky fire, that administrator sudo code fixed it! Thank You, thank you, thank you!

Hi,

Thank you so much it worked. I could finally log into my App store and iTunes.

The sudo command solution worked for me but only until I rebooted my iMac. After the first reboot my Apple ID login to App Store hangs again. BTW my iMac lost S/N after installing El Capitan ("Serial Number Unavailable"). My case is currently handled by an Apple Senior Advisor and will post my solution update here when available.

I'm having a similar problem and have read many forums about fixes. Basically Messages and FaceTime fail to login although all other iCloud / AppleID functions are fine. I've done all the other "fixes" listed on multiple forums to no solution. I've even reinstalled El Capitan on the advice of the senior advisor Shawn Foster who I spent an hour with on the phone. He was to call me back after my reinstall of the OS to keep working on the problem but that was a week ago and he continues to not return messages left on his voicemail. Very frustrating.

The serial number, date/time, location are all accurate. This Terminal option from apenguin does not fix the problem; this seems like a server side problem with Apple and nothing to do with the computer.

Here is the error I get:

I think you should just downgrade it to Yosemite. It is much better. I had the same problem. I erased the whole system. I downloaded the Yosemite on Torrent. Then installed it. Now, I have no problem whatsoever and everything works just fine. By the way, there isn't a huge difference between Yosemite and El Capitan.

I'm not sure it's just with El Capitan. My other computers have it and have no problem. For some reason the Apple servers have stopped authenticating this particular PC and they are not helping at all to fix it...the Tier 2 agent is not answering my multiple messages left for him. I've read multiple forums about this and it apparently is a server side fix only once all the other steps have been done to no avail.

I had this same problem, of not being able to log into anything related to my Apple ID, after migrating some users to one particular iMac. Several other iMacs were working fine with my Apple ID. I spent an entire day trying out EVERY suggestion in this thread, including rebuilding El Capitan. What finally worked for me was rebuilding the Permissions. The clue to this was getting an error message when I first started up iTunes that said I was not "Authorized to do this" activity. However, El Capitan no longer allows rebuilding the Permissions through the Disk Utility (I have no idea why). I read somewhere that Apple is now taking care of the Permissions in some other way???

Anyway, I was able to still rebuild the permissions using the free El Capitan version the utility Onyx. Many thanks to Titanium Software for this handy app. Now all things iCloud are working well. In fact, the entire computer is now working much faster than before.

Any of you who haven't been able to get any satisfaction from the other solutions in this thread might want to try it.

Thanks a lot !!!, This works for me

Great, I worked...

THANK YOU

My graceously aging off-warranty iMac lost S/N after installing El Capitan ("Serial Number Unavailable") and hanged whenever attempting to use my Apple ID. The only solution that worked for me was to reserialize it.

Luckily, I got an assistance with it from Apple which, within 1.5 from my initial call, authorized that job and directed me to a local Apple-authorized service at Microcenter store in Flushing, NY. Ironically, the service manager, after I dragged my heavy iMac there (they do not provide appointment scheduling and not even an ability to talk directly to a Mac tech over the phone) informed me they do not perform deserialization on Macs. Luckily, Apple immediately assisted me over the phone by setting an appointment 2 hours later in a NYC Apple store located 1 hour drive away from that inferior service operation at Microcenter. I was out of the Apple store in 20min with my iMac reserialized free of charge.

Important related questions remain: why Apple does not know what are the actual capabilities of the authorized service places, why there is no tiered catalog of services to avoid similar confusion and why clients are not made aware of it?

this didnt work for me

Hello aPenguin, Thank u for help, I followed your comment and now i can login to my App Store on my mac , but i cant login to my facetime and imessage , can you please help me?

Much respect