I have a Windows Server 2008 Enterprise 32-bit Server SP2 running as the host OS running Microsoft Virtual Server 2005 version R2 SP1. I am having a problem with 2 of the VM's on the system. One is running Windows Server 2003 and the other is running Windows Server 2008. It is a random problem as far as timing but will happen consistently. At some point during a period of 1 to 3 days, the VM's seem to "go to sleep". As in they quit responding to network traffic. As soon as I log into the Virtual Server Manager and access their console (I don't even have to login, I just have to connect to the session) the network connectivity starts responding. I even started a continuous ping on the servers to my workstation. When they would "wake up" they would show no packet loss. The two VM's don't act like this at the same time either. One could be responding to network traffic while the other doesn't. There are no entries in any logs either of application errors or system errors. What is going on?