I have two netware servers, one running Novell OES and another running NW 5.1. The two servers worked fine together for a while but the NW5.1 one now gives a message "Unable to communicate with server' every 15 seconds or so. I am very much a novice at setting up servers and would appreciate a step-by-step guide to diagnosing the problem. The machine can ping itself on the IP Address shown by the Config command but not any other machines on the network. LAN protocol is ARP.