我在Github上有一个git repo，我推了很多提交。但是，今天在尝试git push时遇到了这个错误：
$ git push
Permission denied (publickey).
fatal: The remote end hung up unexpectedly
现在，在告诉我这是其他许多“git push permission denied”问题之前，请注意我能够成功部署到Heroku：
$ git push heroku
......
-----> Launching... done, v19
http://hidden-inlet-6102.herokuapp.com deployed to Heroku
To git@heroku.suggestion-box-app:hidden-inlet-6102.git
6e69075..243b0c8 master -> master
我怎么能够推送到Heroku而不是Github呢？自从我上次成功推送提交以来，我认为我没有对回购进行任何更改。
我试过（重新？） - 添加SSH密钥，但在尝试推送时仍然遇到同样的错误：
$ ssh-add
Identity added: /Users/Anders/.ssh/id_rsa (/Users/Anders/.ssh/id_rsa)
$ git push
Permission denied (publickey).
fatal: The remote end hung up unexpectedly
有关如何解决此问题的任何建议将不胜感激。
以下是一些可能有助于解决此问题的其他参考信息。在此先感谢您的帮助！
$ ssh -vT git@github.com
OpenSSH_5.6p1, OpenSSL 0.9.8r 8 Feb 2011
debug1: Reading configuration data /Users/Anders/.ssh/config
debug1: Reading configuration data /etc/ssh_config
debug1: Applying options for *
debug1: Connecting to github.com [207.97.227.239] port 22.
debug1: Connection established.
debug1: identity file /Users/Anders/.ssh/id_rsa type 1
debug1: identity file /Users/Anders/.ssh/id_rsa-cert type -1
debug1: identity file /Users/Anders/.ssh/id_dsa type -1
debug1: identity file /Users/Anders/.ssh/id_dsa-cert type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.5p1 Debian-6+squeeze1+github9
debug1: match: OpenSSH_5.5p1 Debian-6+squeeze1+github9 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.6
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-md5 none
debug1: kex: client->server aes128-ctr hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Host 'github.com' is known and matches the RSA host key.
debug1: Found key in /Users/Anders/.ssh/known_hosts:1
debug1: ssh_rsa_verify: signature correct
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: Roaming not allowed by server
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey
debug1: Next authentication method: publickey
debug1: Offering RSA public key: /Users/Anders/.ssh/id_rsa
debug1: Authentications that can continue: publickey
debug1: Trying private key: /Users/Anders/.ssh/id_dsa
debug1: No more authentication methods to try.
Permission denied (publickey).
我正在跟踪的存储库：
$ git remote -v
heroku git@heroku.suggestion-box-app:hidden-inlet-6102.git (fetch)
heroku git@heroku.suggestion-box-app:hidden-inlet-6102.git (push)
origin git@github.com:andersr/suggestion-box-app.git (fetch)
origin git@github.com:andersr/suggestion-box-app.git (push)