Do I need a separate firewall program besides windows firewall on a server?
Say Server Essentials 2012, single server, file server and domain controller.
And what does the rest of the network look like? Is this home/personal use, or business? Do you have a firewall at the edge of the network?
Avoid Comodo Firewall 6 for the time being, as this new version has a few bugs in it. Stick to the 5.x versions for now.
What about the Windows Firewall Control? It manages the built-in windows firewall. Been using it for a couple or so years now.