Hyper-V VMs lost all Network Connectivity

[fiza]

I have a Hyper-V Enterprise Full 2008 R2 install (not core). Been running fine with 4 x SVR 2008 R2 VMs, 2 x 2003 VMs, 2 x XP VMs. Yesterday decided to install WDS on the host. Since then all my VMs cannot communicate with the outside world. Cannot ping the host or any devices on the physical network. Nothing has changed as far as I can see except WDS was installed. Uninstalled WDS but still wont connect. I can use Hyper-V manager to connect to each and start shutdown etc but cannot communicate with any from the network.

Any ideas?

[adhutton]

Its something to do with the virtual network connection I think. We had a similar problem.

I will dig around and see if I can find the solution and let you know.

Andrew

[Achandler]

Does the NIC still appear within the VMs when you login locally?

Basically installing WDS messes with the NIC on the physical host, this change has go on to affect the VMs who connect via the same NIC. You probably jsut needs to reassign the NIC to the VMs in HyperV.

[fiza]

I had to delete the Virtual Network connection in the Hyper V manager and recreate it. I used a different physical port and then pointed each VM to the new Virtual connection.
All working now.