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If MobileMe suddenly stops working on the Mac System
I have 2 iMacs and an iPhone all in sync via MobileMe. Out of the blue, one of the iMacs refused to sync. It let me sign in via Preferences » MobileMe; but the Mac was no longer registered and nothing would permit me to re-register the Mac.

All of the other devices were working fine.

Here's how I got it to work again:
  • First sign out from the affected Mac.
  • Then go into Keychain Access. In the list of Keys, seek out a Key called MobileMe Password which has the Cloud icon beside it. It's probably in the Login keychain. Right Click (Ctrl+Click) on this and delete it.
  • Now sign in to MobileMe via Preferences and all will be well. Click on Account and then Advanced and Register your Mac.
  • When you've done that, select items to Sync and when prompted choose Merge -- this is vital to preserve what's on your Mac.

[crarko adds: This sounds like a damaged Keychain, or something getting scrambled with the encryption. I've typically see this with Wi-Fi keys or email passwords getting messed up in the Keychain, and the solution was the same.]
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If MobileMe suddenly stops working on the Mac
Authored by: agentx on Oct 24, '11 11:10:15AM

I second that, the amount of times Keychain entries go bad is unforgivable really and i have had countless issues across my deployments. Often this is the cause of many issues with Authentication to services on OS X and to be frank a bit of a PITA.



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If MobileMe suddenly stops working on the Mac
Authored by: alirob on Oct 25, '11 04:56:23AM

My problem has been similar on my 3 Macs. MobileMe stops functioning. I resolve the problem by going to Mail/Preferences/Accounts. Click on MobileMe and then on the Advanced tab. Click on "Enable this account". That fixes the problem for me, although lately it is recurring quite often.



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If MobileMe suddenly stops working on the Mac
Authored by: RbtMartin on Oct 25, '11 08:31:23AM

You didn't say what operating systems you were using on the Macs or the iDevices. There has been a lot of problems with Snow Leopard and iOS 5 with iCloud.



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