Hello again, I just received this input from Peter MacDougall: "Might also try turning off the adsl/broadband modem but leaving the router/switch on and turning off all software firewalls and antivirus trying and then turning them back on one by one. I have found that my Norton Antivirus internet worm protection compeletly stops the render node. I also have my software firewall, ZoneAlarm, setup on each computer to allow all the computers on the network and the router through without blocking."