Recently, iMessage won't sign in on my MacBook Air (10.8.4). I opened up Messages a couple of days ago, and my iMessage account was signed out. Upon trying to sign back in, I get a message reading:

The registering device does not have the appropriate credentials.

And login fails. Anyone else have this issue?

enter image description here

  • Make sure date and time is auto
    – Skyler 440
    Jul 31, 2013 at 3:44
  • Since the iMessage software doesn't ship anymore, I'll point this to messages.app.
    – bmike
    Apr 1, 2017 at 15:25

4 Answers 4


Follow the steps listed on this page - http://support.apple.com/kb/TS4476

If that doesn't fix your problem, try checking your Date & Time settings (Settings > Date & Time). Make sure "Set date and time automatically:" is ticked, and that your time zone is correct.



killall imagent

in Terminal.app (in /Applications/Utilities) and then start iMessage and log in again.

That fixed the problem for me.

  • Terminal isn't the most beginner friendy, but to brave to go in and restart the specific process that runs the communications is a +1 in my book.
    – bmike
    Oct 2, 2013 at 16:50

The solution here in this thread is how I ended up fixing this:


I updated the Flash player for OS X, then went to PreferencesFlash PlayerAdvanced and told it to clear all browsing data from the local storage cache. After this, I rebooted and was able to login to iMessage on the Mac without the error.

Dumb that this interferes with iMessage, but this did fix it.


I had the same issue and I found out that somehow I was logged out from my account. Just check if that's the case with you. Open Messages application -> click on Messages (on the left upper corner) -> Preferences -> select Accounts -> and then, if you are logged out you will have to enter your iCloud password.

Hope this helps!

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