偶然发现我不能使用SSH从github上拉取代码
报错信息

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ssh: connect to host github.com port 22: Connection timed out fatal: Could not read from remote repository.

Please make sure you have the correct access rights and the repository exists.

我们可以执行如下命令

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$ ssh -v git@github.com
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OpenSSH_for_Windows_8.6p1, LibreSSL 3.4.3
debug1: Authenticator provider $SSH_SK_PROVIDER did not resolve; disabling
debug1: Connecting to github.com [20.205.243.166] port 22.

我们仔细看一下会发现 github.com[20.205.243.166] 后面这个ip地址根本不是github的ip地址，它被篡改了。
所以我们到hosts文件夹中添加一条github的记录就能够成功访问了，但是还是需要SSH的密钥的。
生成密钥的方式网上都有，不再赘述。

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debug1: Trying private key: C:\\Users\\HD/.ssh/id_rsa
debug1: Trying private key: C:\\Users\\HD/.ssh/id_dsa
debug1: Trying private key: C:\\Users\\HD/.ssh/id_ecdsa
debug1: Trying private key: C:\\Users\\HD/.ssh/id_ecdsa_sk
debug1: Trying private key: C:\\Users\\HD/.ssh/id_ed25519
debug1: Trying private key: C:\\Users\\HD/.ssh/id_ed25519_sk
debug1: Trying private key: C:\\Users\\HD/.ssh/id_xmss
debug1: No more authentication methods to try.
git@github.com: Permission denied (publickey).

最后的不允许访问是因为我没有添加密钥。
Ubantu 22.04 如果也出现这种情况，可以做相同处理

其他情况

try another shell.