PC:~$ ssh [email protected]
ssh: connect to host github.com port 22: Connection timed out

解決辦法：（linux下）

~$ cd ~

~$ cd .ssh/

~$ touch config

在.ssh目錄下建立一個config檔案，輸入如下內容：

Host github.com
User [email protected] （你註冊github時的郵箱，這裡使用註冊的使用者名稱也行）
Hostname ssh.github.com
PreferredAuthentications publickey
IdentityFile ~/.ssh/id_rsa
Port 443
可以把以上內容拷到config檔案裡面，注意修改你的郵箱，儲存並關閉

進行測試是否連線上github.com
PC:~/.sshcdPC: ssh -T [email protected]
The authenticity of host ‘[ssh.github.com]:443 ([207.97.227.248]:443)’ can’t be established.
RSA key fingerprint is 16:27:ac:a5:76:28:2d:36:63:1b:56:4d:eb:df:a6:48.
Are you sure you want to continue connecting (yes/no)? y
Please type ‘yes’ or ‘no’: yes
Warning: Permanently added ‘[ssh.github.com]:443,[207.97.227.248]:443’ (RSA) to the list of known hosts.
Hi zhou411424! You’ve successfully authenticated, but GitHub does not provide shell access.
出現Hi xxx!……表示連線成功。