#HyperV – CSV Volumes Pause States, Event ID 5120‏

Microsoft is aware that after installing KB3126593 (MS16-014) there may be an issue that causes loss of network packets between Hyper-V cluster nodes.

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 that 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 ID 7031 with the source: “Service Control Manager”, which indicates “The Windows Firewall Service terminated unexpectedly”.

Microsoft is aware of this problem and are working on a fix with high priority.

Until the hotfix is released, there are 2 known ways to workaround this problem at the moment:

Option 1. Disable the Firewall Logging for all profiles (domain, private, public).

a. Start the Windows Firewall with Advanced Security management console (wf.msc)
b. Right-click Windows Firewall with Advanced Security on Local Computer and select Properties
c. For all profiles (Domain, Private, Public), under Logging, click Customize. Set Log Dropped Packets and Log Successful connections to NO. Or by using the following PowerShell cmdlet: Set-NetFirewallProfile -LogBlocked 0 -LogIgnored 0

Option 2. Uninstall https://support.microsoft.com/en-us/kb/3126593 from the systems. Please note that uninstall KB3126593 requires restart.

More information on Troubleshooting Cluster Shared Volume Auto-Pauses – Event 5120

I will update this post as soon as Microsoft releases the Hotfix for this issue.

Cheers,
-Charbel

About Charbel Nemnom 270 Articles
Charbel Nemnom is a Microsoft Cloud Consultant and Technical Evangelist, totally fan of the latest's IT platform solutions, accomplished hands-on technical professional with over 15 years of broad IT Infrastructure experience serving on and guiding technical teams to optimize performance of mission-critical enterprise systems. Excellent communicator adept at identifying business needs and bridging the gap between functional groups and technology to foster targeted and innovative IT project development. Well respected by peers through demonstrating passion for technology and performance improvement. Extensive practical knowledge of complex systems builds, network design and virtualization.

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