I haven't seen this listed anywhere so here is something I hope helps others. My Windows 2008 WFA server is running Windows Firewall and I didn't want to turn it off for security reasons. However, it was blocking port 80 access to WFA from any other system so I could only manage WFA when running a browser while RDP'd into the WFA server itself with the localhost url. Here are the steps to configure Windows firewall to permit port 80 access to WFA from outside clients. This is for WFA 2.0 but will work for older versions as well (but it may be under the x86 install path).
Apologies if this is a repeat of information I haven't found.
1) Go to Server Manager and then Configuration->Windows Firewall->Inbound Rules.