It will be helpful if you can provide a wireshark trace between Ratel and the Alpha on the machine that runs Ratel. This will help narrow it down.
Other things you can try:
- A ping test to the Alpha Server IP
- A telnet test to the Alpha Server IP:8080
I see that you have opened ports 5080, 7080, 8080, 9080 and 8000. But I am thinking it is some firewall / networking issue at this time but need data.