Porte

https://www.grc.com/x/ne.dll?bh0bkyd2

Er rimelig hurtig og effektiv!

Du skal scrolle lidt ned og vælge Test My Shields.....
Går udfra at du har en Windows Platform.

Active Ports bruger jeg selv og det er et lækkert program ;o)

From the developer: "Active Ports - easy to use tool for Windows NT/2000/XP that enables you to monitor all open TCP/IP and UDP ports on the local computer. Active Ports maps ports to the owning application so you can watch which process has opened which port. It also displays a local and remote IP address for each connection and allows you to terminate the owning process. Active Ports can help you to detect trojans and other malicious programs."

http://download.com.com/3000-2085-10121832.html?tag=lst-0-1