Netconnection is not working on Windows7

Hi,

We've ran into an issue with one of our AIR projects:

We have two tandalone chat clients that connect using this tutorial: http://www.flashrealtime.com/local-flash-peer-to-peer-communication-over-lan-without-cirrus/

Both run and connect perfect on windows XP.

When we install both of them on a Windows 7 system nothing works. They don't get connected to one eachother.

The only difference is: we connect to 127.0.0.1:30302 instead of the ip mentioned in the tutorial.

But since this works fine on XP, we expected it to work on Win7

Could anyone help us out on this one?

Thanks!

Regards

Mario