I have a server running Windows Server 2003. I want to only allow traffic from my IP address and block all other traffic from all other addresses. I'd like to know how to correctly configure this IP Security Policy using the MMC within Windows.
Best place to start is at the Microsoft TechNet IPsec page. It's fairly simple to set up a local IPsec policy that will accept packets from a single address only. I think you'll need two rules: