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With the launch of 10.8 Mountain Lion, Apple replaced iChat with the redesigned Messages app. This has the added feature of letting you login to send and receive text messages to and from any iOS device from your Mac. As long as one had configured OS X to boot from the hard drive, most logins such as Mac App Store, FaceTime, iMessage, and iCloud worked as they did on a standard Mac. However, in late December users started reporting issues logging into iMessage portion of Messages app. The error message reads: Could not sign in to iMessage. The server encountered an error processing registration. Please try again later.
If you have this error on a CustoMac, update to the latest Chimera 2.0, reboot, and try again. iMessage login should work. So what happens if this doesn't fix the issue? What happens if you're using a standard Mac? There are a few things you can try.
Option 1: Set Network Device Priority

Option 2: Erase all Network Settings then Re-Add Devices

Option 3: Change Your Apple ID Password
Added July 2013: http://www.tonymacx86.com/general-help/104646-simple-fix-imessage-change-password.html
You can check to see what en0 and en1 are inside /Applications/Utilities/System Information under the Network area. If none of these solutions help you, you can try a reinstall or an alternate network device. Hope this helps!
If you have any solutions that aren't listed here, feel free to add them in the comments.
If you still can't log into iMessage or FaceTime, try xzenue's FileNVRAM solution version 1.1.2 from here http://public.xzenue.com/downloads/ This module is no longer packaged with Chimera by default. To use, put FileNVRAM.dyib in /Extra/modules and reboot.
Related:
Chimera 2.0 with iMessage Login Fix
If you have this error on a CustoMac, update to the latest Chimera 2.0, reboot, and try again. iMessage login should work. So what happens if this doesn't fix the issue? What happens if you're using a standard Mac? There are a few things you can try.
Option 1: Set Network Device Priority
- Open System Preferences > Network
- In lower right corner, choose the gear icon dropdown as shown below and choose Set Service Order...
- Drag your current network device to the top of the list. This sets your priority as en0. This is 1st priority. For multiple network device connections, make sure Ethernet is en0 (1st priority) and Wifi as en1 (2nd priority).
- Reboot
- Try iMessage login again

Option 2: Erase all Network Settings then Re-Add Devices
- Open Finder and navigate to /Library/Preferences/SystemConfiguration/
- Delete the files inside the SystemConfiguration folder
- Reboot
- Open System Preferences > Network
- Re-add Ethernet and/or Wifi by using the +
- Try iMessage login again

Option 3: Change Your Apple ID Password
Added July 2013: http://www.tonymacx86.com/general-help/104646-simple-fix-imessage-change-password.html
You can check to see what en0 and en1 are inside /Applications/Utilities/System Information under the Network area. If none of these solutions help you, you can try a reinstall or an alternate network device. Hope this helps!
If you have any solutions that aren't listed here, feel free to add them in the comments.
If you still can't log into iMessage or FaceTime, try xzenue's FileNVRAM solution version 1.1.2 from here http://public.xzenue.com/downloads/ This module is no longer packaged with Chimera by default. To use, put FileNVRAM.dyib in /Extra/modules and reboot.
Related:
Chimera 2.0 with iMessage Login Fix
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