Kaspersky users, and perhaps others, might also notice that the firewall raises an alert when their apple notebooks or desktops attempt to connect with the Apple Store. Even more frustrating was the fact that I could log into the store with the same password on all of my other Apple devices - just not the macbook nor the iMac. Frustratingly for me, the pc’s could still access the store and everything appeared to work OK, until/unless I was asked for my Apple ID password, and in that case, it refused to connect. Your solution was immediately effective and I thank you for the advice. after I updated all of my phones and tablets to iOS 9.1 (which was another drama that need not be repeated here) and I changed my Apple ID in consequence of the hand-held update setup steps when the MacBook and iMac would not connect to the store. Your suggestion helped me immediately on both the macbook pro and the iMac, neither of which would connect to the Apple store, nor permit certain downloads etc. I was bitterly disappointed in Apple’s lack of meaningful support, and the evident creation of problems where none formerly existed. Since I did not change anything from when I was running Yosemite without problems and completing the 'Upgrade', and I followed Apple's instructions to the letter in preparing for and carrying out the upgrade, I can only assume Apple screwed up and they don't care. This is preventing me from working efficiently and ruining my enjoyment of this very expensive computer. An online chat session with Apple support at least got me logged into my icloud account to manage the password etc, but nothing more. I have deleted plugins, extensions and just about everything that is not Apple, to no avail. I have deleted a shed load of third party software - none of which uses icloud. I can sign into icloud via preferences, I can login to the Apple ID server to manage my icloud account, but I cannot connect to App store or Itunes store - the error is always the same: : 'There was an error connecting to the Apple ID server'.

I have the same problem with iMac 27' late 2013 model.

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