Over and over again: port scan TCP issuing from my mac. How can I stop this

I have set our router to send me an alarm whenever it is attacked.
I have noticed before that when I use Google Maps, Google Earth, Google's Picasa my mac attacks other IP's with a port scan TCP.
As of this morning my mac has startet to attack our router about every minute, and none of the above applications ist running.
How can I get this to stop?

I'm experiencing a similar issue with some of the systems I support at a University. One was issuing tons of outbound ICMP requests to address 0.0.0.0 and another was port scanning a (seemingly) random name server. The systems themselves are behind a pretty aggressive firewall, as far as inbound traffic goes. Any thoughts?

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Over and over again: port scan TCP issuing from my mac. How can I stop this

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