Bugcheck 9E referencing netft.sys on Hyper-V Cluster server node running Server 2012 with SEP 12.1.6 client installed. A cluster server node is repeatedly hanging. After the server experiences the hang, it falls out of the cluster due to the cluster watchdog process resulting in the crash dump with a bugcheck 9E. After 4 or 5 minutes it will restart and upon restart the server may experience the hang issue again.
When in this state, it does connect to the cluster node and appears to be functioning as expected.
The Symantec Endpoint Protection client will communicate with the manager
You can access the server shares through UNC connection
Administrators can connect to the server through RDP, other remote management options such and receive login screen
However after supplying credentials at the login prompt, the login process will not proceed and may result in a black screen. The machine will eventually restart and may continue to loop through this process and experience the symptoms as described above.