How to run web application in NetBeans IDE, with in the bundled Tomcat?

I’m using Netbeans 5.5.1 with bundled tomcat 5.5.17. Each time, when I try to run a web app (even the sample web projects coming with Netbeans IDE), i receive the following error: "starting of tomcat failed". But when My PC is connected to the internet all works fine. I don't know why Netbeans fails to connect to Tomcat server when there is non internet connection

Thanks for your help

  Applies to: NetBeans IDE 5.5.1 with bundled tomcat 5.5.17
  Platforms: windowsXP SP2.
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