Hyper v manager: "virtual machine connection has stopped working", when connect to VM

Question

Hello,
cannot find any info on web and View problem details in VIRTUAL MACHINE CONNECTION error box:
"virtual machine connection has stopped working".
I get this error when click Connect in HV Manager. The machines are on and are accessible through RDP.
This is a lab host after restart it randomly works. I have this problem during last week.
Just interesting to know what could cause the problem and if other were seeing something like that...
Also, can connect to machine from SCVMM.
Thx.
"When you hit a wrong note it's the next note that makes it good or bad". Miles Davis

Answer 1

I have the same problem.. Running hyper-v manager from win7 x64 client...
Problem details:
Description:
Stopped working
Problem signature:
Problem Event Name: CLR20r3
Problem Signature 01: vmconnect.exe
Problem Signature 02: 6.1.0.0
Problem Signature 03: 4ce75fbd
Problem Signature 04: vmconnect
Problem Signature 05: 6.1.0.0
Problem Signature 06: 4ce75fbd
Problem Signature 07: 107
Problem Signature 08: 29
Problem Signature 09: System.ArgumentException
OS Version: 6.1.7601.2.1.0.256.4
Locale ID: 1033
I have the exact same issue (running windows 2008 R2 Enterprise). I can RDP to any of the VM but simply cannot connect using console.  This is causing me grief since I have to create few more VMs and work with the existing VMs.  Without console
access, I cannot create and do any config changes for new VMs.  Can someone help. Things that I have tried so far.
1. Exported VMs
2 uninstalled .NET 4 & 3.5.
3. Hyper-v role removed.
4. Reinstalled Hyper-v, reinstalled .NET 4 & 3.5, patch current as of today.
5. Imported the VMs back and still cannot connect.  Exactly same error.  No errors in any logs in event viewer or Hyper-v logs. 
6.  Navigated to c:\Program Files\Hyper-v and manually run the VMCONNECT.EXE app (choosing the localhost/server and appropriate VM from the list) but no dice. The app just sits there for ever without any connection.
7.  I am baffled and surprised no one has a solution.  Tried multiple search engines.
8. The host machine is patch current as of today and there are no patches available to try.  Reading through some forums, I have also installed some hotfixes with no luck.
9. Finally, I can see the little graphic for each VM changing as windows is loading or stopping in server manager for hyper-v.
Hoping someone has a solution.  The error that pops up is exactly similar and no clues of the faulting module.
Appreciate your time and help.