Q: Can't log into App Store, iCloud, or Mail in macOS Sierra
Since upgrading to macOS 10.12 on my late-2013 MBP retina, three login problems have arisen.
1. I cannot login to iCloud. I tried logging out, rebooting, and logging back in, but the busy wheel just keeps turning; occasionally a "Verification Error: unable to reach Apple servers" error will come up, but more often then not it won't.
2. I cannot login to the App Store. Again, after having connection issues after the upgrade, I tried logging out, rebooting, and trying to log back in. Now, however, the login prompt doesn't come up, even if I go to Store > Sign In...
3. I cannot login to Mail. This is a Gmail account (IMAP). I tried removing the account entirely and re-adding, but when the little Mail window pops up to take me to my Google account, the window just keeps loading without ever successfully connecting. This is odd because I have no issues with connecting to Gmail or any other Google site (or any site period) via my web browsers.
So far, I've gone through all the steps of this thread (OS X: "Cannot connect" or "Cannot connect to the App Store. An internet connection is required" - Apple Support) but to no avail.
MacBook Pro with Retina display, OS X El Capitan (10.11.6)
Posted on Oct 11, 2016 8:41 PM
SOLVED IT. The problem was the automatic proxy I use. After upgrading to macOS Sierra, the URL of the automatic proxy had been filled in multiple times. I went to System Preferences > Network > Advanced > Proxies tab and just unchecked the automatic proxy box. Everything immediately connected after that.
Posted on Oct 21, 2016 7:46 PM