I have two MBPs on the same network in my apartment, call them MBP A and MBP B. When I try to screen share MBP B's screen on MBP A, the window that asks for the name and password to share the screen of MBP B pops up. I fill out the correct name and password, but then when I click connect, I get an "Authentication failed" message and it asks me to enter the name and password again. This repeats two more times, and then on the third time, I am able to connect successfully and share MBP B's screen. After the connection is established, there are no other problems. This is starting to drive me crazy. I have disabled and enabled screen sharing, but I dont know what else to do? Does anyone know what is going on here?