A Windows Server 2008 R2 Virtual Machine may crash with a blue screen after configuring NLB on it

We have heard from a few customers about an issue with configuring Network Load Balancing (NLB) on Windows Server 2008 R2 virtual machines. This problem may occur with a Windows Server 2008 R2 virtual machine (guest) on Hyper-V or VMware.

When you configure NLB on a Windows Server 2008 R2 system that is a virtual machine, the system may crash with a blue screen with the error shown below. Another possible symptom is that the guest system may hang.

*** STOP: 0x0000007C (0x0000000000000014, 0x0000000000000002, 0x0000000000000000, 0x0000000000000000)

BUGCODE_NDIS_DRIVER

Researching this issue, we found the issue happens only when some anti-virus products are installed on the Windows Server 2008 R2 virtual machine. If we remove the anti-virus software and then configure NLB, everything works fine.

We have found the following workaround has been successful for customers we’ve worked with on this issue:

Configure NLB on the Windows Server 2008 R2 guest before installing anti-virus software. Anti-virus software may then be installed. If the issue still occurs, please contact Microsoft Support.

– Saravanan N