Q: Authentication iMessage Error Yosemite

I have a collection of Apple kit here (Who doesn't eh!) but have an issue with JUST ONE of them a MacPro using a FireWire Camera.

With the Messages Application.

When I try and log into iMessage via Messages/Preferences I get the following message.

"Could not sign into iMessage - An error occurred during Activation. Try again" I have tried again several hundred times over several weeks. No change. Sometimes it looks like its going to succeed and the menu options start to appear but then exits and reports back as above.

I know the username and password are correct as that is the same information I use on other machines fine (typically a 2013 MAcBook Air).

Any thou

Posted on Nov 27, 2014 6:22 AM

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Q: Authentication iMessage Error Yosemite

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by Eric Root,Helpful

Eric Root Nov 27, 2014 4:19 PM in response to David Pearson
Level 9 (72,398 points)

iTunes

Nov 27, 2014 4:19 PM in response to David Pearson

Messages – Can’t log in

Messages - Error Processing Registration
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by David Pearson,

David Pearson Nov 28, 2014 5:14 AM in response to Eric Root
Level 2 (220 points)

Nov 28, 2014 5:14 AM in response to Eric Root

Eric,
thanks for the response. Sadly not solved yet.

I checked through the link and did the imagent force quit. It went for a second then re-appears. Started Messages and get the log-in screen, but sadly still doesn't work. checked the hosts file and there isn't a firewall issue here.

Any other ideas?
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by kayylmao,

kayylmao Oct 12, 2015 10:42 PM in response to David Pearson
Level 1 (0 points)

Oct 12, 2015 10:42 PM in response to David Pearson

I know this was almost a year ago, but I'm having literally the same exact issue right now. It's been happening for weeks not only on my MacBook Air, but my iPad as well. Did you ever fix the issue? I'm desperate. I receiving the exact same error/authentication message as you did. I've searched the Internet/forums on here for almost 4 hours now. Nothing is helping me.
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Q: Authentication iMessage Error Yosemite

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by Eric Root,★Helpful

by David Pearson,

by kayylmao,

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by Eric Root,Helpful