I run winodws 2000 professional. I have disabled most unnecessary services and managed to stop all ports from listening EXCEPT one. So I downloaded Port Explorer to see if I could track down the final listening port. Port Explorer lists it as System, PID = 8. The protocol is TCP and both the local and remote IP's are 0.0.0.0. The local port seems to vary between 1025 and 1035 and the remote port is listed as port 0. I do not believe that this open port is caused by DCOM as I ran the decombobulator from grc.com and port 135 is totally closed now. Aswell I do not have universal plug and play running. Anyone who can help me figrue this out would be my hero! Thank you in advance to anyone with suggestions!