Use port 443 for SSH. Github allows you to use https port for SSH connections. This usually by passes most firewall restrictions.

1. Test the connection to port 443: ssh -T -p 443 git@ssh.github.com

if you see usename! You've successfully authenticated. The connection is working. 2. Modify your SSH configuration

• Open the config file in your terminal: nano~/.ssh/config
• Paste the following

  Hostname ssh.github.com
  Port 443
  User git  
  

• try git push