Teste a conexão SSH para GitHub
$ ssh -vT [email protected]
> ...
> debug1: identity file /Users/you/.ssh/id_rsa type -1
> debug1: identity file /Users/you/.ssh/id_rsa-cert type -1
> debug1: identity file /Users/you/.ssh/id_dsa type -1
> debug1: identity file /Users/you/.ssh/id_dsa-cert type -1
> ...
> debug1: Authentications that can continue: publickey
> debug1: Next authentication method: publickey
> debug1: Trying private key: /Users/you/.ssh/id_rsa
> debug1: Trying private key: /Users/you/.ssh/id_dsa
> debug1: No more authentication methods to try.
> Permission denied (publickey).
AHMED SHIREF