today I sign out from iCloud from my Macbook and reboot. After that I tried to sign in again from the System Preferences, but I always receive an error said: "You can't login at this time. Please sign in again."
Nothing worked so I tried to login to apple.com to manage my Apple ID and that worked.
So I tried to login in icloud.com from web and TA-DA! I cannot login there too.
I receive this error log: http://pastebin.com/dseJks18