I apologize if there is a separate thread for Hyper-V running on Windows 8.1 vs this Server thread.  Couldn't find one specific to Hyper-V on Windows 8.1.

We have had for months now 3 Windows 8.1 workstations running Hyper-V with Windows 7 guest OS's. These guest were used to support clients that required a rather tight VPN connection. Suddenly last week all 3 machines has the same issue.

The guest no longer have internet connectivity.  One workstation has Broadcom NIC other 2 have Intel.  It's as if some Windows patch did something that caused the Virtual Switch to stop working.

Have blown away the VM's, dropped the Virtual Switch.  Ran updates.  Recreated the Virtual Switch and built new VM.  Still same condition.

The host to continues to connect to network and internet without issue.

Any suggestions would be appreciated.

• Moved by BrianEhMVP Wednesday, September 02, 2015 6:35 PM

There is a Win8 forum here (for future ref)

https://social.technet.microsoft.com/Forums/en-US/w8itprovirt/threads

Is this in a corporate environment?  If so, were any changes made to the switches?  I've seen environments where the switch is locked down to only allow one MAC/IP per port, which knocks off any VMs.

Are you getting any DHCP information? Can you assign a static IP and get connectivity?

• Marked as answer by Curtis Broyles 10 hours 38 minutes ago

There is a Win8 forum here (for future ref)

https://social.technet.microsoft.com/Forums/en-US/w8itprovirt/threads

Is this in a corporate environment?  If so, were any changes made to the switches?  I've seen environments where the switch is locked down to only allow one MAC/IP per port, which knocks off any VMs.

Are you getting any DHCP information? Can you assign a static IP and get connectivity?

• Marked as answer by Curtis Broyles Thursday, September 03, 2015 8:45 PM

OMG.  I did have a new switch put in and sure enough it's doing exactly as you said.

I never would have connected the two.  You have saved me a ton of hours of troubleshooting.

Thank you.