【转自StackOverflow】解决无法连接github：ssh: connect to host github.com port 22: Connection timed out fatal: Could not read from remote repository.

$ git clone git@github.com:xxxxx/xxxx.git my-awesome-proj
Cloning into 'my-awesome-proj'...
ssh: connect to host github.com port 22: Connection timed out
fatal: Could not read from remote repository.

$ # This should also timeout
$ ssh -T git@github.com
ssh: connect to host github.com port 22: Connection timed out

$ # but this might work
$ ssh -T -p 443 git@ssh.github.com
Hi xxxx! You've successfully authenticated, but GitHub does not provide shell access.

$ # Override SSH settings

$ vim ~/.ssh/config
```
# Add section below to it
Host github.com
  Hostname ssh.github.com
  Port 443
```
$ ssh -T git@github.com
Hi xxxxx! You've successfully authenticated, but GitHub does not
provide shell access.

$ git clone git@github.com:xxxxxx/xxxxx.git my-awesome-proj
Cloning into 'my-awesome-proj'...
remote: Enumerating objects: 15, done.
remote: Counting objects: 100% (15/15), done.
remote: Compressing objects: 100% (14/14), done.
remote: Total 15 (delta 0), reused 15 (delta 0), pack-reused 0
Receiving objects: 100% (15/15), 22.90 KiB | 4.58 MiB/s, done.

按此方法可以ssh走443端口，不知道为什么最近github抽风了，我的所有设备都无法拉取代码和上传代码，换网络，换手机热点网络都不行，但是这样ok