Q: Can't login to iMessage and FaceTime

I have the same issue. Can anyone help me? Please.

If it's the same as mine, it's a security feature at Apple's server that accidentally got triggered somehow. The ONLY solution is for Apple engineering to do some magic at their server. You need to call Apple support and then you need to be very persistent and probably very patient. You also have to insist that it qualifies for FREE support because it's an account issue, not a hardware issue.

Hi,

Read my reply of the 17th April.

10:09 pm      Wednesday; August 31, 2016

I've been in detailed discussions with Apple about this for a few weeks now and finally a solution has been found.

Problem description:

Mac fails to log in to Messages, FaceTime and App Store, with an error such as "an unknown error occurred". All other logins and iCloud functionality is normal - only these three items are affected.

Solution:

There is a known issue in which the Mac may fail to log in to the App Store if there is no "en0" Ethernet port present. I know it sounds weird but it is a fact. It can happen (not sure how) that a computer ends up with no "en0" assigned, which was my case - my WiFi had somehow become assigned to "en3" and no "en0" was present. Once this en0 issue is resolved, the App Store magically works again - and I found that the login issue with Messages and FaceTime was likewise resolved at the same time.

To resolve this issue, delete WiFi plist files in /Library/Preferences/SystemConfiguration. (Note this is at the System level, not at the User level). You can find the how-to with a Google search. Then reboot, whereupon the rebuilt plist file will properly assign en0. After that all these logins should start working again.

To find out what Ethernet port your WiFi is assigned to, go to Apple logo - About This Mac - System Report - Network/WiFi.

Hopes this helps somebody. It worked for me!

Hi,

If you look in System Info > Network > Locations you can see what the Ethernet and the WiFi cards have been given along with Blue Tooth (en3 for me) and the Thunderbolt bridge.

Also in Applications/Utilities and launching the Network Utility and then the Info tab the drop down also lists them.

However Blue Tooth does not appear here.

Having said that it does seem the sort of unlikely but odd thing that happens to the OS now and then.

I have been aware that it did not seem to be one model more than any other  and that virtually every version since Version 7.0.1 has had this issue in some way.

Thanks for this info.

7:37 pm      Tuesday; September 6, 2016