If the Gmail account that you use to login to iTeleport (or iTeleport Connect) with is setup using 2-factor authentication, you need to follow a few special steps.  With 2-factor authentication, you cannot use the same password in iTeleport. you use to login to Gmail.  You'll need to generate an "application-specific password."

To do this, follow these steps:

1. Go to this link and login to your gmail account: https://accounts.google.com/b/0/IssuedAuthSubTokens
2. Scroll down to the Application-specific Passwords section and go through the steps there to generate a password for iTeleport.
3. Enter in that generated password when you log into iTeleport.