I tried all the tips, nothing worked. I have to say it only started to happen after I made a fresh OS X install. Before it was working beautifuly.
Then I decided to investigate a little deeper. When one attempts to sign-in in Messages or FaceTime a few logs appears on the Console (Applications -> Utilities -> Console):
<a timestamp> apsd[<pid>]: Certificate not yet generated
The apsd is the Apple Push Notification service daemon, wich runs in background and will deal with Apple Push Notifications.
Everytime I tried to sign-in a few of those would appear. Well, if aspd is telling the certificate is not yet generated then it probably is not doing some of its work because of that. So I searched for that log message and found that in order to generate de certificate the machine serial number is needed. The serial number is written in the mainboard. I had my machine serviced once and the mainboard was replaced. For some reason the serial number was not written on this new board. Thus, my Apple -> About This Mac was showing " Serial Number serial# " instead. Then I took the machine to the support guys, this Blank Board Serializer tool was executed and the serial number was properly written in the mainboard.
Guess what? Messages and FaceTime worked! And that "Certificate not yet generated" log message is now gone.
So, it may help you:
- Check if your "About This Mac" shows the correct machine serial number
- Check if your Console logs show any "Certificate not yet generated"
- If both are true, take the machine to an Apple Store and have them write the serial number for you.
