So ever since I updated to BitComet 1.35 I have had the problem with UPnP NAT port mapping - Failed. since I went back to 1.34 the problem has stopped since this port mapping problem happened it was saying TCP Listening Port was blocked/Firewalled I hope others have this problem or I may have had a bad install of the file.
I updated to BitComet 1.35 without any problem and its working fine. I think reinstalling the software will solve your problem..
that’s wat im thinking too thank you for the reply
well it was a dirty install works fine now been watching it for a few days everything is good!!!