Windows Firewall is disabled. There are Windows 7 computers on the same subnet as the server which have working FOG services so the antivirus is not blocking the FOG service.
Unfortunately, the command recommended by Jose did not help, though I appreciate the ideas.
I’ve come across a few other threads where people have similar problems, but I haven’t seen any direct solutions related to this specific Windows 7 subnet issue. I’ll keep working on it though.