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I am setting up a new Windows Server 2012 R2 with 5 Hyper-V VM, I created the first 2 and the Virtual NIC was working, then I created the next one and 2 after and now the Virtual NIC will not at all

I am setting up a new Windows Server 2012 R2 with 5 Hyper-V VM, I created the first 2 and the Virtual NIC was working, then I created the next one and 2 after and now the Virtual NIC will not work on any of the VM's, I have deleted the Virtual Switch and recreated it and I even tried the Legacy adapter with no luck, at this point any assistance would be awesome. I can tell you on the physical server the virtual nic shows internet up.
Server HardwareVirtualizationMicrosoft Legacy OSHyper-V

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dtssupport

8/22/2022 - Mon
Schuyler Dorsey

Can you confirm your HyperV host does not lose network connectivity? (I assume so but wanted to double check)

When the virtual NIC stops working, does it just show as disconnected in the VM?
dtssupport

ASKER
No network connectivity issues, the Physical Nic is in Ethernet port one and working just fine, the Virtual is using Ethernet port#2 and it was created with the install of Hyper V and when I create the first 2 VM's they were picking up the virtual nic without any issues and then working on the 3rd one I noticed that the NIC was not connecting and not getting an ip address, and went on and created the 4th and 5th and when I got done, none of the vNICS will not connect but the Virtual Adapter on the Server shows Internet showing, not sure where to go from here
David Johnson, CD

Is Ethernet port 2 connected to anything?  You could change the virtual switch to use ethernet port 1
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William Peck
Lionel MM

Are the VMs you are creating the same (all 5 are Win7 for example)? If not it may be a NIC driver in the 3rd VM--assuming the 3rd is a different OS than the first two. If they are all the same OS for all 3 then I would still check the device manager to make sure a NIC driver installed--then check the IP settings.
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dtssupport

ASKER
It was an internal switch issue causing the problem with the NIC Cards