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Message: [QUOTE="Ilja Mäki, post: 495480"] I have Windows XP Home Edition. I turned on its firewall and noticed that according to the log file it creates my computer (the source IP address in the log file is the one of my computer) seems to open TCP and UDP ports to some IP addresses every few minutes though I (or any other one in the local area network) am not using the internet. After a short while the ports are closed according to the log file. The port numbers often appear to be sequential. Is this normal? Or is my computer infected by some virus that is doing some sort of port scanning? How can I get to know which application or process is opening those ports? How can I stop that? I am using AVG virus scanner Free Edition. It found a dialer virus in my system yesterday (which I moved to Virus Vault and then deleted) but not anything that seems to be causing this. Thank you for any help! Regards, Illi [/QUOTE]