Microsoft Knowledge Base Article - 330904
According to this article The Messenger service uses UDP ports 135, 137, and 138; TCP ports 135, 139, and 445; and an ephemeral (that is, short-lived) port number greater than 1024.
Make sure your firewall is set up right. Default settings don't...
If you are curious to see this in action you can spam yourself. Make sure messenger service is on in services. From your command promt C:\>net send your IP your message here.
What SaigonK said is what you do.
I have to point out no a firewall will not stop this. If you people that said get a firewall would like me to prove it send me your IP and make sure the service is on. I have tested it with zone alarm pro, tiny, sygate, norton internet security. The message...
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