Ok I have seen in your log the changes for the static address of the Xbox, but unfortunately no changes in behaviour.
Xbox still does not respond to ping and googling a bit I learned that xbox is one of those rare devices that does not run an ICMP server proces to respond on pings (only on startup but not when xbox is operational), damn Microsoft

hmmm.
I'm still puzzled by this line
DEBUG 2013-08-15 14:15:06.861 [New I/O worker #4]
DLNA changes for Xbox 360
What does it mean? Maybe one of the code experts could explain, as I could not find it in the code.
Please help us out guys.
In the mean time we can check some more. I'll try to put it in a little list and I'm not sure if it helps, but we have to keep trying...
In your router:
-there must be some setting / swith for uPNP, it should be set to "enabled".
The firewall settings of your Windows PC:
I checked my own firewall setup on Windows 7 64 bit regarding UMS and I have following incoming 'allow' rules in place that you might want to check in your setup:
- javaw.exe (TCP)
- ums.exe (Any)
- wrapper.exe (Any); you only need this one when running UMS as a service
- port 5001 rule (Any); the default UMS listening port (also if you're using a different port number you have to use that value)
- port 2869 rule (TCP); used for DLNA / uPNP discovery (SSDP)
- port 1900 rule (UDP); used for DLNA / uPNP discovery (SSDP)
I have not included the full path to the executables because that can be different in your setup.
Since you already streamed movies from Xbox it is very likely that these are all in place, but let's check it anyway.
If you are in doubt about the firewall rules, you might also consider a test with the complete firewall disabled. (make sure that your router cable towards the internet is physically disconnected at least for test).