Windows 2012 R2 Hyper-V – vNICs and VMs lose connectivity at random

The Admin Rules

UPDATE (2/5/2014): I spoke too soon (should’ve known better).  The patch below, although it seems to help, DOES NOT fix the guest vNIC disconnect issue.  We have had two machines in particular go offline (off the network).  The issue IS resolved by live migrating the machines to a new host but this is not an acceptable alternative.

My suggestion…look to other hypervisors for your production environments until MS has retooled R2 to work as intended.  Xen and VMware I know work and have for some time now.

After two long month and hours upon hours of frustration dealing with this issue it appears Microsoft has finally issued a hotfix (KB2913659) that resolves the behavior.

The issue we were having is well documented in several blog posts (blog1blog2).  Some of our VM guests would intermittently lose network connectivity through the parent hosts virtual switch.  Most of the…

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