Thanks Jedimaster for replying...
Yes, clients connect without problems on the LAN.
The server has a dynamic IP through DHCP although it has not changed for more than a year, but yes, it's dynamically appointed.
Both TCP and UDP ports are mapped in the NAT (RRAS) to the lan server ip.
I Just looked up the articles on MSDN you mentioned and they confirm my NAT is set up by the book.
Yet more strangeness; A couple of friends have teamed up trying to solve this mystery by hooking up their own machines, LAN-servers through NAT onto the internet. We all run dsl with dynamically appointed ip-addresses and using win2k and .net rc1 servers. Same problems for everyone of us, the servers won't map the ports onto the lan. =(
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