How To Fix Synthetic Ethernet Port Error In Hyper V

How To Fix Synthetic Ethernet Port Error In Hyper V | the application encountered an error while attempting to change the state

Fix: Ethernet Switch Error Virtual machine failed to start in Hyper-V 2019
Sometimes due to the result of system or hardware changes, a virtual machine fails to start properly usually because it cannot read the existing system resources on your computer. There are variations of the issue where virtual machines can’t be started because of the Ethernet virtual switch errors.
An error occurred while attempting to start the selected virtual machine(s). Synthetic ethernet Port: Error Insufficient system resources exist to complete the requested service. Failed to allocate resources exists to complete resources to a virtual network. The Ethernet switch may not exist.
The error code implies there is an issue with one or more virtual switches that are assigned to the virtual machine(s). The virtual switch may be deleted from the Hyper-V host or it is not working properly.

There are three types of virtual switches; Private switch which provides only communication between the virtual machines, Internal switch which provides communication between host and virtual machines and External which provides communication between virtual machines and the rest of the network.

We need to identify which virtual switch has a problem and then fix it accordingly. It is also necessary to investigate if the same problem exists on all virtual machines that are using a certain virtual switch or only on an individual virtual machine.

This issue is not only related to Hyper-V 2019 but also to previous versions of Hyper-V Servers and Hyper-V Clients. We will simulate the same problem on Hyper-V 2019 and a virtual machine with the Windows Server 2019 installed.

In the first step, we will check if the Configuration error is shown within the virtual machine that has a problem.
Hyper V not starting Synthetic Ethernet Port Error
All of a sudden any HyperV VM's I create will not start. (When connected to any virtual adapter) If I have the network adapter disconnected the VM will start. I have installed HyperV on another computer connected to my domain and I have the same issue. I have also uninstalled any AV software.

I suspect something on my Domain is blocking HyperV from working properly. However after 2 weeks of investigations, I am unable to find the cause.

Regards
Quazi Mahmudul Huq
Senior Faculty
IT System Admin
MCT, MCP, MCSA, MCSE, RHCSA, RHCE
RHCSV, CCNA, CCNP, MTCNA, MTCRE

[coolruehle]

Audio is a bit sketchy on this video, but content is SPOT ON!! Thanks so much! So simple!

[themikelush]

This was very helpful, I was able to fix this exact problem. Thank you😊

[Pontie]

I'd like to thank you for this very useful howto that saved my life down here. keep going!!

[kavishkhedhoo]

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