Git通过SSH拉取报错kex_exchange_identification

Git拉取数据报错：

kex_exchange_identification: Connection closed by remote host
Connection closed by 140.82.121.3 port 443
fatal: Could not read from remote repository.
Please make sure you have the correct access rights
and the repository exists.

排查问题步骤：

1、Ping 140.82.121.3

看一下这个ip能不能访问？

我想起我修改过host文件，看一下host文件有没有问题

140.82.121.3 github.com
140.82.121.3 ssh.github.com

通过debug查看为什么报错？

在Git Bash运行指令

ssh -v [email protected]

@符前面是github的用户名

$ ssh -v dreambird25@github.com
OpenSSH_9.0p1, OpenSSL 1.1.1o 3 May 2022
debug1: Reading configuration data /c/Users/Administrator/.ssh/config
debug1: /c/Users/Administrator/.ssh/config line 1: Applying options for github.com
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Connecting to ssh.github.com [140.82.121.3] port 443.
debug1: Connection established.
debug1: identity file /c/Users/Administrator/.ssh/id_rsa type 0
debug1: identity file /c/Users/Administrator/.ssh/id_rsa-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_9.0
kex_exchange_identification: Connection closed by remote host
Connection closed by 140.82.121.3 port 443

可以看到已经建立连接了，说明github上的ssh配置没有问题

但是为什么连接被远程主机关闭了呢？

Git拉取数据用的域名是ssh.github.com

检查一下域名对应的ip有没有140.82.121.3

打开站长工具多个地点ping服务器-网站测速-站长工具

ping ssh.github.com 检测发现很多地区都ping超时，并且下面的独立ip里面并没有发现140.82.121.3由此可见host文件的ip写错了

在独立ip里面找一个能ping通的，很多ip 都超时了，发现了一个ping通的ip

修改host文件

140.82.121.3 github.com
140.82.121.35 ssh.github.com

现在看一下能不能拉取

拉取成功啦