Hyper-v Manager fails to connect

I'm administrating a small network with a SBS2008 running virtual.
The virtulization server - named HOST1 - has a strange and annoying problem!

Sometimes the Hyper-V Manager looses connection with the virtual machines.
I can start the HV Manager and see the the local server name in the upper right corner but I can't connect.

The servers running virtual is NOT affected and is functioning normal.
When this happens apparantly the only thing I can do is restarting HOST1.
Restarting Hyper-V services does not help.

Any suggestions :-)
OhmitAsked:
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santoshgb24Connect With a Mentor Commented:
when you experience such problem , just check are you able to access sbs server through remote desktop. Also try reinstalling hyper integration service
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OhmitAuthor Commented:
I am fylly able to access the servers running virtual through Remote Desktop.
Nothing seems to be affected - except that I find it concerning that I can't use the HV Manager.

How do I reinstall the Hyper-V Integration service?? :-)
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Rob WilliamsConnect With a Mentor Commented:
There are some known connectivity issues between host and VM. Try disabling DMA and Large Send Offload on the Host's NIC, as per the following article:
http://blogs.technet.com/b/meamcs/archive/2011/01/08/unstable-connectivity-behaviour-on-hyper-v-guests.aspx
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kevinhsiehConnect With a Mentor Commented:
There are many hotfixes for both Hyper-V 2008 and Hyper-V 2008 R2 that you won't get via Windows Update. There are two technet articles listing all of them. A Google search will find them. You will find that Hyper-V runs a lot better when fully patched.
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OhmitAuthor Commented:
Great guys!!

Now I have a lot to try out so I think I close the case for now.
Thanks for all your input, :-)
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