ssh: connect to host github.com port 22: Connection refused

假设git例如，下面的问题时，远程推送：

[fulinux@ubuntu learngit]$ git push -u origin master
ssh: connect to host github.com port 22: Connection refused
fatal: Could not read from remote repository.

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

能够採用例如以下方法：

[fulinux@ubuntu ~]$ vim .ssh/config

Host github.com
User fulinux@sina.com
Hostname ssh.github.com
PreferredAuthentications publickey
IdentityFile ~/.ssh/id_rsa
Port 443

測试连接是否成功：

[fulinux@ubuntu ~]$ ssh -T git@github.com
Hi fulinux! You've successfully authenticated, but GitHub does not provide shell access.

推送：

[fulinux@ubuntu learngit]$ git push -u origin master
The authenticity of host '[ssh.github.com]:443 ([192.30.252.151]: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)? yes
Warning: Permanently added '[ssh.github.com]:443,[192.30.252.151]:443' (RSA) to the list of known hosts.
Counting objects: 23, done.
Delta compression using up to 2 threads.
Compressing objects: 100% (18/18), done.
Writing objects: 100% (23/23), 1.87 KiB | 0 bytes/s, done.
Total 23 (delta 6), reused 0 (delta 0)
To git@github.com:fulinux/learngit.git
 * [new branch]      master -> master
Branch master set up to track remote branch master from origin.

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