I must have done this a dozen times. I follow the instructions at http://help.github.com/mac-set-up-git/
Permission denied (publickey,keyboard-interactive).
fatal: The remote end hung up unexpectedly
I have double checked a valid email which is the same email I use on github. I also have set my profile up properly using:
$ git config --global user.name "Firstname Lastname"
$ git config --global user.email "your_email@youremail.com"
I also make sure that when I copy my key over that no newline or spaces are in the text.
I am pulling my hair on this one.
ssh -T git@github.comor, even better with debugssh -vT git@github.com– Lazy Badger Nov 3 '11 at 8:27