I have a small query if soneone can respond. I want to know if there is any issue in running Windows Domain controller service on a Windows cluster which is running Oracle Real application cluster. The configuration is 2 nodes Windows 2000 cluster and RAC ( Oracle ver. 220.127.116.11). We frequently encounter ipc errors on either/both of the nodes and while every other parameter has been checked, it has been suggested that this could be due to the domain authentication service running on the cluster. I want to know if it is recommended by Oracle not to run this service while running RAC ? I tried searching on the metalink however could not find relevant information.