I am also having issues...
I have an DUE R3 and Ethernet R3 and I don't seem able to get the Chatserver example to work.
I can see the Ethernet Rx light but no tx light.
The serial monitor works, but I can't get a telnet connection.
Can any one point me in the right direction, or at least say they have the same hardware working?
I'm running on a 64bit Windows 7 Professional machine with service pack 1.
Thanks