I have 6D and trying to pair it with my computer running Windows-8. It worked once, but after that pairing utility never finds the camera. The C:\Program Files (x86)\Canon\EOS Utility\WFTPairing\EOSUPNPSV.exe is taking around 40% of the CPU cycles, and stays there.
I reset the camera WiFi settings and now its in the last stage of pairing.
I see this on the camera:
EOS-C78751 pairing in progress. Start pairing software on computer.
On the computer WFTPairing is running, and as mentioned taking huge chunks of CPU. Firewall turned off on my computer. I checked with a UPnP spy utility, and can see 6D on the network, but the Pairing utility seems to not. I tried reinstalling EOS utility multiple times too.
I think I've got it licked...at least until it breaks again...lol.
In my first post, I confirmed that UPnP was enabled on my router (a Netgear WNDR3400). What I didn't realize is that the UPnP settings were configured to check for devices every 30 minutes!! I dropped that down to 1 and was able to connect flawlessly in less than a minute.
I did need to run the WFT Pairing Utility as an admin & did the same when I launched the EOS Utility just to be safe.
When Commodo barked about the new programs being installed, I made sure I answered every query with the response of treating it as an allowed application.
So, for now anyway, it's running like a champ. I'm transferring a full size raw file in about 13 seconds. Woohoo!