unwanted DNS-request opens SoHo-Router connection

Hi,

my network is a 4 PC home-LAN with a 10/100-switch and an ISDN-Router (with NAT configured) connected to it.

I have newly installed a Win2Kpro-Client and I always get those DNS-requests (every minute or so), even though I don't do anything.
I have installed the Outpost Firewall and to make surfing work, i have to open DNS for outgoing connection...

Does anybody knows, what program/service requests those DNS at Win2K? ... or how can i look for this proggi?

Thanks for your tipps

Higg

Which DNS requests do you mean? Need more info... event log?

Does the IP address start with 224 ?