在 Linux 上尝试将通过 SSH 连接到 your GitHub Enterprise Server instance 时，可能在终端上看到以下信息：
$ ssh -vT git@hostname
> ...
> Agent admitted failure to sign using the key.
> debug1: No more authentication methods to try.
> Permission denied (publickey).更多详细信息请参阅本问题报告。
解决方法
通过使用 ssh-add 将密钥加载到 SSH 代理，应该能够修复此错误：
# start the ssh-agent in the background
$ eval "$(ssh-agent -s)"
> Agent pid 59566
$ ssh-add
> Enter passphrase for /home/you/.ssh/id_rsa: [tippy tap]
> Identity added: /home/you/.ssh/id_rsa (/home/you/.ssh/id_rsa)如果密钥没有默认文件名 (/.ssh/id_rsa)，必须将该路径传递到 ssh-add：
# start the ssh-agent in the background
$ eval "$(ssh-agent -s)"
> Agent pid 59566
$ ssh-add ~/.ssh/my_other_key
> Enter passphrase for /home/you/.ssh/my_other_key: [tappity tap tap]
> Identity added: /home/you/.ssh/my_other_key (/home/you/.ssh/my_other_key)