github 莫名无法 push 代码，
报错：
fatal: unable to access 'https://***.git/': SSL peer handshake failed, the server most likely requires a client certificate to connect重新按照官方文档生成ssh key。并添加后执行 ssh -T git@github.com 报错:ssh_exchange_identification: Connection closed by remote host
执行ssh -vT git@github.com代码如下：
$ ssh -vT git@github.com
OpenSSH_6.9p1, LibreSSL 2.1.8
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 21: Applying options for *
debug1: Connecting to github.com [1.111.11.111] port 22.
debug1: Connection established.
debug1: identity file /Users/yangzhongjing/.ssh/id_rsa type 1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/yangzhongjing/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/yangzhongjing/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/yangzhongjing/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/yangzhongjing/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/yangzhongjing/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/yangzhongjing/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/yangzhongjing/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.9
ssh_exchange_identification: Connection closed by remote host这里面/Users/yangzhongjing/.ssh/id_rsa 这个文件是存在的。不知道为什么会报：key_load_public: No such file or directory
网上搜了很多执行了以下方法都没有效果：
vim /etc/hosts.allow 添加 sshd: ALL
ssh-add ~/.ssh/id_rsa
调整了 /etc/ssh/sshd_config 中的 MaxSessions 10 调大
删除 ~/.ssh目录重新生成ssh key
