Problem: a new virtual machine had been created in our virtual environment. After a day or so it suddenly stops accepting RDP connections. It cannot be pinged and the only way to log on is to log on as Local Admin via the Virtual Machine Manager console. To all intensive purposes it appears to be off the network. At the same time a much older VM also started experiencing the same issue.
Temporary Solution: Rebooting the machine apparently fixes\resolves the issue....for a while
Permanent Solution: Check the ip address/MAC address for conflicts with other VM machines. If there is a conflict in one of these areas, rebooting will work for a bit but as soon as the network detects that there is a conflict between two ip addresses or MAC address it will take down one of the machines.
After further investigation it turned out that both machines were built from the same template which in spite of having been set to Dynamically generate a MAC address had resulted in two machines getting the exact same MAC address. A small gotcha but one which can be a bit of a pain to troubleshoot.
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