Hyper-V Virtual Switch Manager

Posted on 2015-01-15
Last Modified: 2015-01-30
I have a laptop that runs Hyper-V on it for development of applications.  Yesterday all of the sudden I lost network connection inside one of my virtuals.  

I went to the Hyper-V manager and clicked on the Virtual Switch Manager.  It comes up displaying an alert box that says 'An error occurred while trying to retrieve a list of virtual switches.  The operation on computer 'localhost' failed.

After some fiddling I noticed that in the device manager there are 5 anomalies.  
-Under Network adapters, the 'Microsoft Hyper-V Network Switch Default Miniport' has an alert by it because it's driver is giving a code 39
-There is now an unknown device listed.  It traces to ROOT\VMBUS. This device is not there in between installing Hyper-V so it is related to it somehow.
-3 devices under 'system devices' have the yellow alert and give a code 39.  Hyper-V PCI Server, Hyper-V Virtual Disk Server, Hyper-V Virtualization Infrastructure Driver.

Trying to update the drivers does not work.  Windows reports back that the drivers are current and up to date.  I cannot uninstall the Network Switch Default Miniport.  I try to click it, it asks if I want to uninstall, but does nothing.  Tried again making sure that Hyper-V service was not running to no avail.

Tried uninstalling and re-installing Hyper-V but it always comes back the same.

Any other ideas?
Question by:joebu23
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LVL 39

Expert Comment

by:Philip Elder
ID: 40551666
I take it the 39 errors are inside the VM? Re-install Integration Services and reboot the VM.

Author Comment

ID: 40551741
The errors are on the host system in the device manager.  I cannot boot up any cm at the moment.   It hangs when trying to start one.
LVL 39

Expert Comment

by:Philip Elder
ID: 40551806
I'm looking at my device manager right now for a Windows 8.1 desktop that has Hyper-v installed and there are no Hyper-V related components listed.

VMBus and the like are a part of Integration Services that get installed into a VM to allow it to interact correctly with the hypervisor and thus the host's hardware.
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Author Comment

ID: 40551815
If I uninstall hyper v from the host those devices go away but as soon as I re-enable hyper v they show up again.  Sadly I cannot remember if they have always been there.
LVL 39

Expert Comment

by:Philip Elder
ID: 40551902
There is an ISO called VMGuest.ISO or something along those lines. Did Integration Services somehow get installed on the host?

The only Hyper-V reference in my own Device Manager now that I've delved deeper into it is for the vSwitch driver under Network Adapters.

In the VM itself I see a bunch of Hyper-V drivers under System Devices which is where these belong.

Author Comment

ID: 40551961
I don't know if integration services did get installed to the host.  They must have at one point. I ended up wiping the drive and starting fresh as that particular machine had several other issues.  (Also couldn't waste anymore time on it as is.  Two days fixing an issue is a little much)  The main issue is the vSwitch driver, which stopped responding and refused to be uninstalled.  Would an install of integration services on the host cause that driver to break?
LVL 39

Accepted Solution

Philip Elder earned 500 total points
ID: 40552042
It could certainly muck things up. They do not belong on the host at all.

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