Q: Mac Pro - Yosemite - iMessage won't connect

FaceTime, Game Center, Messages: Troubleshooting sign in issues

Hi Adam,

I have a similar problem.  I updated to Yosemite on my early 2009 Mac Pro.  Everything is working great and I can log with my Apple ID for iTunes, Mail, Facetime, etc. Everything EXCEPT for Messages. I get the message:

Could not sign in to iMessage.

Could not sign in. Please check your network connection and try again.

I have gone through the troubleshooting guide linked to my Linc Davis above and that did not help. I even deleted Messages using App Zapper and reinstalled Yosemite but the problem persists. To reiterate, ALL of my other applications that use my Apple ID work except for Messages.

Maybe when iOS 8.1 is released on Monday it may resolve this problem?

Some more info: I logged out of user account on my Mac Pro. I logged back in as Guest. Opened up Messages and was able to sign in using my Apple ID - so this is definitely NOT a networking issue. Could there be some kind of configuration file that needs to be reset?

I am having the same issue with Messages on a 2010 MacPro. I performed a clean install of Yosemite on my MacPro and MacBook. The MacBook can login to Messages but the MacPro is giving the "Could not sign in to iMessages" error. I even tried copying all the Message preference files over from the MacBook to no avail.

Same problem here. Working on a 2010 MacPro model.

Hope apple is gonna fix this problem quickly!

Mac Pro (2009) - I have the same issue after updating to Yosemite iMessage (Inactive). Same account works fine on my Macbook Pro with Mavericks.

Yep, likewise same issue. MBP 2011

Quick update - last reboot FaceTime asked for a login, this is the fourth time its asked since the upgrade. Messages allowed me to login but the minute I clicked on the  Details button in Messages/Preferences/ Accounts it booted me out with the same error.

Hi Everyone. I had this problem on a 2009 Mac Pro. Here is how I solved it:

1) Reset your computer's PRAM

2) Boot your computer in Safe Mode

3) At this point I was able to log into FaceTime and Messages

4) Reboot into Normal Mode

I was then able to login to FaceTime and Messages without a problem.

Way to go!! Solved my 2009 Mac Pro Message issue to.

Thank you! That solved my issue too

Sounds like something in the user account library and preferences and mail is out of whack when install is an "upgrade" over the old system and user.

Has anyone else had the issue when images are showing in iMessage? I cannot see them in the chat itself or in the Details screen. It only shows as a bubble/file w/ the filename