Firewall stops Eclipse console output

I have used Eclipse for more than 5 years now, updated now and then. I downloaded the latest fancy smancy version, Eclipse 3.3 Europa, and all of a sudden it stops giving me console output when I command an ant build on one of the projects. I tried to google up an exlanation of this behaviour, alas to no avail. It took me some hours to get the idea to turn off the firewall. This made the trick. I am writing this down so hopefully the solution will be faster to find when googling next time.

Issue: No eclipse console output
Solution: Allow eclipse to communicate through your firewall

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