You are currently offline, waiting for your internet to reconnect

NTLM Dependency on Windows Failover Clusters

When you disable NT LAN Manager (NTLM) authentication on a Windows Server 2008 or Windows Server 2008 R2 Failover Cluster, you may get following error during various configuration steps are performed on the cluster.  

Error Code: 80070721
A security package specific error occured.

For example you will get above error when running Cluster Validation and when you create the Cluster. 
This Error is logged because the cluster service has a dependency on NTLM.
This Behavior is by design. Microsoft recommends not to disable NTLM when Cluster Services are used.
There are certain parts of the cluster code that rely on NTLM. Cluster Shared Volumes and the Network Topology wizard are some examples. 

NTLM can be disabled by following GPO:

  • Network Security: Restrict NTLM:Incoming NTLM traffic - Deny all accounts
  • Network Security: Restrict NTLM:Outgoing NTLM traffic to remote Servers - Deny all
947049 Description of the failover cluster security model in Windows Server 2008
Note This is a "FAST PUBLISH" article created directly from within the Microsoft support organization. The information contained herein is provided as-is in response to emerging issues. As a result of the speed in making it available, the materials may include typographical errors and may be revised at any time without notice. See Terms of Use for other considerations.

Article ID: 2720392 - Last Review: 06/04/2012 18:12:00 - Revision: 1.0

Windows Server 2008 Datacenter, Windows Server 2008 Enterprise, Windows Server 2008 R2 Datacenter, Windows Server 2008 R2 Enterprise

  • KB2720392