If you've been having this dialogue box pop up when waking your MacBook Pro...
Then this fix may work for you!
Warning, this may break your ability to use back to my mac.
Open Network preferences, select your network port (Airport or Ethernet) and click on the Advanced button. Click on the TCP/IP tab and set the Configure IPv6 drop down menu to Off. If you use both ports then make the same change for both ports.
Open Sharing preferences and reset your Computer Name.