When trying to Live Migrate virtual machine in Windows Server 2008 R2 Failover Cluster it fails with:

Event ID: 5120

"Cluster Shared Volume ‘Volume1′ (’Cluster Disk 1′) is no longer  available on this
node because of ‘STATUS_BAD_NETWORK_PATH(c00000be)’.  All I/O will temporarily 
be queued until a path to the volume is  reestablished."

Check if you have File and Printer Sharing and Client for Microsoft Networks enabled on all cluster iSCSI interfaces. For some reason Microsoft doesn’t mention it (at least not that I know of) but enabling these services seems to work.