I've posted the easiest way on the forums before i'll go look up the link:
illuzn's reply to I NEED HELP !!!!!
Follow the steps there.... it will work 100% of the time... although you do still need to use a command prompt... i've pretty much given a step by step set of instructions. I'll clarify them again here:
1. Goto Start-->Run-->taskman.exe
2. Click on the processes tab, find the messenger process (msnmsgr.exe) and grab its
PID If you don't see a PID column goto View-->Select Columns and turn on the PID column
3. Goto Start-->Run-->cmd.exe
4. Download the portqry file and put it in c:\ root...
5. Run the following code... *note* the first entry is to navigate to c:\ (you can put it elsewhere just navigate there)
code:
cd c:\
portqry.exe -wpid *insert process id here* -wt 2
6. Send a file to the contact you want to interrogate
7. You will see a connection with a port other than 80 and 1863 that is the ip of your contact