Several months ago we got a call from a client with a standalone 2012 R2 HyperV host: Absolutely NO network traffic was going through any of the virtual switches, yet we could see no errors or warnings of any kind in any of the logs. Desperate to get them back up and running we simply deleted all the virtual switches, recreated them (identical to what they were) and reattached all the VMs. We chalked it up as a fluke....until today:the EXACT same thing happened to a completely different customer.
Clearly there is something systemic here which needs to be addressed. I dont want to get another call in the middle of the night to have to recreate virtual switches.
