I’m currently trying to use Comodo Firewall to prevent Steam from downloading content from servers not controlled by my ISP, as I need to conserve my download quota.
Steam uses port 27030 to download content to its client, so I have my application restrictions for Steam set up thus:
Allow TCP/UDP In/Out from Any to Any from Any Source Port to Any Destination Port Not 27030
Allow TCP/UDP In/Out from ISP Server IP 1 to Any from Any Source Port to Destination Port 27030
Allow TCP/UDP In/Out from ISP Server IP 2 to Any from Any Source Port to Destination Port 27030
Block TCP/UDP In/Out from Any to Any from Any Source Port to Destination Port 27030
However this seems to currently block all access to Port 27030, as, whilst viewing active connections with TCPView, the ISP servers are blocked while Steam is searching for servers, and any active connections to these servers that appear when the firewall is disabled are closed when the firewall re-enabled.
So, is this the way to only allow these servers to access these ports within this program?
I am currently using Windows 7 64 bit, with the latest Comodo download for this system. I am using wireless internet, which comes in through a hub and is connected with ethernet to my computer.
Thanks for your help.
EDIT: Added the In/Out status, and this is the order that these rules are written in the Network Security Policy screen.