Hej Christian
I think everybody gets those if you're connected to the internet!
It is showing that somebody or something (script kiddies or a vira) is attempting to exploit some security vulnerabilities. Only they are _very_ stupid, since they have not detected that your box is not a windoze box.
Don't worry - it's not harmfull to you except for your lost bandwidth and cpu cycles.
There's nothing you can do about it either

It's just the common general pollution of the internet.
Holger