First try the suggestions in this thread: https://ttlc.intuit.com/questions/4150878
Essentially deleting the Keychain passwords and deleting preferences. This might fix the problem if its due to your Mac trying to enter the wrong username/passwords.
This didnt work for me though. I was also getting the "Connection Problem" window each time trying to import from Its Deductible. I was running TurboTax on OSX 10.11.1. (Apple in top left corner>About this mac). I then ran the Mac Operating System update to OS 10.11.6, and that fixed the problem. See my thread here: https://ttlc.intuit.com/questions/4246662-turbotax-gives-an-error-message-of-a-connection-problem-wh...
