I have a Windows NT 4 server and a SCO Openserver machine on the same network (100BaseT cards with a 100BaseT hub). Both have TCP/IP installed. NT IP addr=10.0.0.2 (Mask 255.255.255.0), Openserver IP addr=10.0.0.20 (Mask 255.255.255.0) Both in the same domain. I can ping localhost and local IP addr on both machines but cannot ping the other machine. Both cards have links and the activity light flashes on both cards during the ping. The message on the Openserver machine is 'host is down'. The message on the NT machine is 'Request timed out.' What should I check out?