Microsoft is aware that after installing KB3126593 (MS16-014) there may be an issue that causes loss of network packets.
This may cause Cluster Shared Volumes (CSV) on the nodes Failover Clusters to going into a paused state with an event ID 5120 in the System event log what indicates “Status c000020c – STATUS_CONNECTION_DISCONNECTED”.
You will also find that, on the node that owns the CSV volume(s), there will be an event 7031 with the source: “Service Control Manager”, which indicates “The Windows Firewall Service terminated unexpectedly”.
Troubleshooting Cluster Shared Volume Auto-Pauses – Event 5120. https://blogs.msdn.microsoft.com/clustering/2014/12/08/troubleshooting-cluster-shared-volume-auto-pauses-event-5120/
Microsoft is aware of this problem and are working on a fix. But until it is release here is what you could do to get around this issue:
Option 1: Disable the Firewall LOGGING for all profiles (domain, private, public). (just the logging, not the firewall . You don’t want to be un-protected)
1. Start the Windows Firewall with Advanced Security management console (wf.msc)
2. Right-click Windows Firewall with Advanced Security on Local Computer and select Properties
3. For all profiles (Domain, Private, Public), under Logging, click Customize. Set Log Dropped Packets and Log Successful connections to NO.
Option 2. Uninstall https://support.microsoft.com/en-us/kb/3126593 from the systems.
I will post an update once Microsoft releases the Hotfix.
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