Got internet connection but none of the apps will access

I am new in the mac-world and I encountered a first problem: for some reason none of my applications have access to internet anymore though everything worked fine a couple of hours ago. Now it works neither with cable nor wirelessly. I had little snitch installed but after the demo was over I deinstalled and restarted the mac. Now, the diagnose says there is no problem and it looks like everything was fine, but I can't access the internet with none of the apps (firefox, entourage, skype, adium, software update....). Maybe I changed any preferences I shouldn't have when I was playing with the system preferences...
can anybody pleeeaasseee help me?
thanks

jumpartist wrote:
for some reason none of my applications have access to internet anymore though everything worked fine a couple of hours ago.
Welcome to Apple's discussion groups.
You might try resetting your connection settings using the steps listed in this message:
http://discussions.apple.com/thread.jspa?messageID=10695921&start=1
They're not guaranteed to solve the problem, but they'll only take a minute or so to try.

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