Problem with internet connection

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Oct 5, 2010
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Dear all,

Since yesterday all of a sudden my internet connection stopped working.
The weird thing is that not all connectivity is lost.
Skype, VPN (and connection to remote servers for dtata transfer) work, but Safari and Mail stopped working.

I have two internet connections possible: USB dial-up stick and WiFi.
First I guessed the stick was not working anymore and switched to WiFi but there only skype and VPN worked.
Could it be that the stick configured to take over all "normal" internet traffic for itself but since it didn't work anymore (maybe too much data transfer or operator network broke down) i lost internet connection? Even unplugging the internet stick and restarting the machine didn't give any improvment.

If run the apple diagnostic tool it says all is fine.
The weird thing is that when i launch it the internet is marked yellow (as configured but not active) but switches green during the test.

I have no clue anymore in where to look.
Any virus?
Any suggestions in hidden parameters to check?
Why would it stop working from 1 sec to the other?

Thanks a lot for your help in advance
 

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