ssh on 443

Some Examples

Host github.com
  Hostname ssh.github.com
  Port 443
  User git
  
Host gitlab.com
  Hostname altssh.gitlab.com
  Port 443
  User git
  
Host bitbucket.org
  Hostname altssh.bitbucket.org
  Port 443
  User git

Notice

Git on Windwos uses a different config file. It lays on <GIT_INSTALL_DIR>/etc/ssh/ssh_config.
You need to config in file above.