我无法执行“Git pull”请求，因为会出现公钥错误（见下文）。
git pull
权限被拒绝（公钥）。
致命：远端意外挂断
运行配置设置检查（' ssh -vT[电子邮件保护] '），这就是我得到的：
OpenSSH_5.6p1, OpenSSL 0.9.8r 8 Feb 2011
debug1: Reading configuration data /Users/snowmac/.ssh/config
debug1: Reading configuration data /etc/ssh_config
debug1: Applying options for *
debug1: Connecting to github.com [204.232.175.90] port 22.
debug1: Connection established.
debug1: identity file /Users/snowmac/.ssh/id_rsa type 1
debug1: identity file /Users/snowmac/.ssh/id_rsa-cert type -1
debug1: identity file /Users/snowmac/.ssh/id_dsa type 2
debug1: identity file /Users/snowmac/.ssh/id_dsa-cert type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.5p1 Debian-6+squeeze1+github12
debug1: match: OpenSSH_5.5p1 Debian-6+squeeze1+github12 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/snowmac/.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/snowmac/.ssh/id_rsa
debug1: Authentications that can continue: publickey
debug1: Offering DSA public key: /Users/snowmac/.ssh/id_dsa
debug1: Authentications that can continue: publickey
debug1: No more authentication methods to try.
Permission denied (publickey).
我注意到的关键部分是：
debug1: Connecting to github.com [204.232.175.90] port 22.
根据 Git hub（https://help.github.com/articles/error-permission-denied-publickey） 应该：
debug1: Connecting to github.com [207.97.227.239] port 22.
我认为这是我的问题，但我尝试过刷新 DNS、更改 DNS 服务器，但都无法更改 IP 地址。如果 IP 地址不正确，Git Hub 文章除了检查拼写外没有提供任何解决方案。
关于如何解决我的问题有什么想法吗？
(编辑)——SSH 密钥几周前还可以用。自从我上次在这台机器上使用 git 以来已经有一段时间了。