Win7 firewall blocking radius requests

I have installed an open source radius server on my Windows 7 machine & I want to know why Windows 7 is blocking Radius server requests inbound? A device on my LAN sends an authorization request on UDP port 1645 towards the radius server. To confirm
this, I put a packet sniffer just before the radius server to check the requests are coming inbound & I checked the port, so I'm certain it's coming in on 1645 (the actual request comes from a switch and the source and destination ports were the same in
the capture). I therefore created an inbound rule to allow this through the Windows firewall but it doesn't appear to work. When the firewall is disabled, the authentication request is successful.
I can't actually attach a picture, so I will just explain the rule as best I can:
Accept inbound UDP port 1645 to any port. All profiles (domain, private, public), all programs, and all IP addresses
I'd like to know if there is a way I can see a live feed of denied packets inbound so I can spot what is actually causing the problem 

Look for a blocking rule. Windows Firewall might have created a blocking rule or there might be a different blocking rule causing the problem.
Also turn on logging of dropped packets in the windows firewall so that you can see if it is the one dropping the traffic.

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