git push失败，提示connection timed out_connection timed out could not read from remote re

1. 报错信息

# git push
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.

2. 以前是可以使用的，突然无法push，找了些方法，如重新添加ssh key，最后想到换了网络环境，可能是防火墙导致无法访问22端口

3. 解决步骤

1）测试可用性

ssh -T -p 443 git@ssh.github.com

提示如下证明可用

Hi username! You’ve successfully authenticated, but GitHub does not
provide shell access.

 或

The authenticity of host '[ssh.github.com]:443 ([20.205.243.160]:443)' can't be established.
ECDSA key fingerprint is SHA256:p2QAMXNIC1TJYWeIOttrVc98/R1BUFWu3/LiyKgUfQM.
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added '[ssh.github.com]:443,[20.205.243.160]:443' (ECDSA) to the list of known hosts.
Hi username! You've successfully authenticated, but GitHub does not provide shell access.

2）编辑~/.ssh/config 文件

本windows下，路径为C:\Users\用户名\.ssh，没有config文件则添加一个，没有后缀。再该config文件中添加内容

Host github.com
Hostname ssh.github.com
Port 443

3）再次测试

ssh -T git@github.com

提示如下即可用

Hi username! You’ve successfully authenticated, but GitHub does not provide shell access.

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参考：

解决 ssh: connect to host github.com port 22: Connection timed out - SegmentFault 思否

记一次git push失败，提示connection timed out - 卡里的技术博客