Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

The problem I am having is that it seems like any network traffic on a guest virtual machine locks out RDP access to all guest instances and to the host.

For example, if I initiate a file copy from my NAS to a guest via RDP, as soon as the file copy starts, my RDP session gets dropped. At this point, I can no longer RDP or ping any of the guests nor can I get into the host server.

When the file copy completes, access is immediately restored.

My configuration is:

  • Windows Server 2008 R2
  • Dell 2900, 18g RAM, Dual NICs, only one is hooked up though
  • Guests instances are also Server 2008 R2 using the same NIC as the host
  • Gigabit switch
  • NAS is a Synology DX1511+

My first thought is that I should not be using one NIC for both the guests and the host. What is the recommended configuration?

My second thought is that I need to look at the NIC card for some sort of issue. I don't see anything in the event viewer.

Thank you in advance.

share|improve this question
up vote 0 down vote accepted

Yes, it is usually better to have a network adapter for the guests external network that is separate from the Hyper-V host.

Also, on the guests, you should verify the following network adapter > advanced settings:

  • Jumbo packet: Disabled
  • Large Send Offload (IPV4): Disabled
  • Large Send Offload (IPV6): Disabled
share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.