I have an ESXi host with 2 Windows 2012 VMs running on it. Several times over the past couple of weeks, one of the VMs (I'll call it vmA) has lost its network connection. When it happens, I can log into the host with the client and see my two VMs running. I can do everything I need with vmB, as it doesn't lose a thing. With vmA, I can pull up the console, but I cannot log in, as it says there are no logon servers available.
I cannot ping vmA from anything, including from vmB. From vmB, I get "destination host unreachable".
I bounce vmA and it comes back up and works perfectly. In the event logs on the vm, I see nothing except an error that states it can't reach a domain controller anymore. Other services still try to work, as I see errors stating that they cannot reach databases or anything else they need on the network. In the ESX client, I see no Events or Tasks at all regarding either VM, as nothing was done.
Anyone have any ideas? This vmA actually is a domain controller and DHCP server for a small office, so if it's not working, none of the DHCP clients, which include telephones, can work.
