Mac Pro (Mid 2010) and Mid (2012): Migration does not complete

In some situations, a migration on a Mac Pro (Mid 2010) or (Mid 2012) may not seem to complete or may stop running and report a Network Connection message.

This article has been archived and is no longer updated by Apple.

This can occur in these situations:

  • The Ethernet cable is unplugged while you attempt a network migration over Ethernet.
  • The wireless network connection is lost during a wireless migration.
  • The computer falls asleep during migration.

Power off the computer by holding down the power button.  Depress it once more to turn the computer back on.  If the Migration Assistant does not restart, run it later after completing the Setup Assistant.  The Setup Assistant is in the Applications/Utilities folder.

If you choose a wireless migration, make sure you are on the best wireless connection available. Use the Signal Strength meter in the upper-right corner of your screen to find a location that provides the best signal to your source computer before you start. You may also want to eliminate potential sources of interference as well. The best wireless migration experience will be on an 802.11n network.

Try these steps to prevent your source computer from going to sleep during the migration:

  1. Choose System Preferences from the Apple () menu on the source computer.
  2. Choose Energy Saver from the View menu.
  3. Adjust the slider for Computer sleep" to Never.
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