I have a domain setup with around 50 server 2003 boxes and 2x server 2008 DC's. Intermittently servers are dropping off the network and when you try and log on you get the "domain is not available" or "there is not enough memory to process the request" messages. If I log on locally using the ILO i can ping the DC but I can't ping the server from the DC. Following a reboot of the box they will work ok again. I've tried using perfmon to see if it's a memory leak and that is ok and I've disbaled the TCP offset and RSS options in the NIC cards as per an MS KB.
Is there any other way of troubleshooting these issues?