I have 2 HP ML 350 servers installed with windows 2003 advanced server and is in clustering environment. presently the NIC card of primary server was replaced after becoming unserviceable. I am able to ping the secondary server. But there is some problem with networking as cluster services are not working. When I checked the system properties the "change" option is grayed out and message is appearing that "The identity of this computer cannot be verified because networking is not installed or not properly configured" . Please advice for a solution without reinstalling the Op system

Hi Prasanthk,Thank you for posting in windows server forums, Can you please tell us "But there is some problem with networking as cluster services are not working. " what service are you referring , also please do provide the corresponding event id from the server. i hope you have configured multiple adapter in unicast mode ?how many number of cluster have you configured ?AFAIK NLB doesnt work in unicat / multicast mode, just a trigger to check ,