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"NLB Stopped - Configuration Failure" error message may occur when you try to enable the NLB feature in Forefront TMG 2010 if the network adapters are VLAN tagged or teamed

SYMPTOMS
Consider the following scenario:
  • You install Microsoft Forefront Threat Management Gateway (TMG) 2010.
  • You install some 802.1Q VLAN tagged network adapters or some network adapters that use network adapter teaming software.
  • You try to enable the Network Load Balancing (NLB) feature by using the Forefront TMG Microsoft Management Console (MMC) snap-in window.
In this scenario, you may receive the following alerts in the Forefront TMG MMC snap-in window:
NLB Stopped - Configuration Failure
Description: The Firewall service failed to apply the Network Load Balancing (NLB) configuration on the local computer.
This event can be safely ignored, if followed by an NLB Started event.
The failure is due to error: Element not found.

NLB Configuration Cannot Be Removed
Description: Network Load Balancing configuration settings cannot be removed.
The failure is due to error: Element not found.
Additionally, the following events are logged in the Firewall log:

Source: Microsoft Forefront TMG Firewall
Event ID: 21107
Description: The Firewall service failed to apply the Network Load Balancing (NLB) configuration on the local computer. This event can be safely ignored, if followed by an NLB Started event.
Additional data: 90040780

Source: Microsoft Forefront TMG Firewall
Event ID: 31503
Description: Network Load Balancing configuration settings cannot be removed.
Additional data: 90040780

CAUSE
This issue occurs because Forefront TMG 2010 has limited support for VLAN tagged network adapters and because Forefront TMG 2010 has no support for teamed network adapters.

Note This hotfix adds support for teamed network adapters to Forefront TMG 2010.
RESOLUTION

Update information

To resolve this issue, install the software update that is described in the following Microsoft Knowledge Base (KB) article:
2433623 Software Update 2 for Microsoft Forefront Threat Management Gateway (TMG) 2010 Service Pack 1
STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
REFERENCES
For more information about 802.1Q VLAN tagging on NLB enabled adapters, click the following article number to view the article in the Microsoft Knowledge Base:
2286940 802.1Q VLAN tagging on NLB enabled adapters
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates
Properties

Article ID: 2449122 - Last Review: 11/16/2010 09:42:00 - Revision: 1.0

  • Microsoft Forefront Threat Management Gateway 2010 Service Pack 1
  • Microsoft Forefront Unified Access Gateway 2010
  • kbfix kbsurveynew kbexpertiseinter kbqfe KB2449122
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