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Network Load Balancing cannot be configured properly because there is no suitable network adapter

Microsoft.Forefront.TMG.Network_Load_Balancing_cannot_be_configured_properly_because_there_is_no_suitable_network_adapter.Rule (Rule)

This Rule generates alerts when Network Load Balancing cannot be configured properly because there is no suitable network adapter

Knowledge Base article:

Summary

The Firewall service generates this alert when it detects that a network which is not directly connected (has no associated adapter) is NLB enabled.

A "network behind a network" cannot be enabled for NLB, because no adapter can be associated with the configured Virtual IP (VIP) address.NLB is functional if this error occurs, but the traffic may not pass through TMG Server as expected.

Causes

The Firewall service may encounter the illegal configuration described above for one of the following reason:

Resolutions

External

Microsoft TechNet Web site

Element properties:

TargetMicrosoft.Forefront.TMG.NLB.ServerComponent
CategoryEventCollection
EnabledTrue
Alert GenerateFalse
RemotableTrue

Member Modules:

ID Module Type TypeId RunAs 
DS DataSource Microsoft.Forefront.TMG.Rule.AlertGenerate.DS Default
WA WriteAction Microsoft.Forefront.TMG.Rule.AlertGenerate.WA Default

Source Code:

<Rule ID="Microsoft.Forefront.TMG.Network_Load_Balancing_cannot_be_configured_properly_because_there_is_no_suitable_network_adapter.Rule" Enabled="true" Target="Microsoft.Forefront.TMG.NLB.ServerComponent" ConfirmDelivery="true" Remotable="true" Priority="Normal" DiscardLevel="100">

  <Category>EventCollection</Category>

  <DataSources>

    <DataSource ID="DS" TypeID="Microsoft.Forefront.TMG.Rule.AlertGenerate.DS">

      <ComputerName>$Target/Host/Host/Property[Type="Windows!Microsoft.Windows.Computer"]/NetworkName$</ComputerName>

      <LogName>Application</LogName>

      <EventsPattern>^(21113)$</EventsPattern>

      <EventType>1</EventType>

      <SourcePattern>[Microsoft Forefront TMG Firewall]|[Microsoft Forefront TMG Control]</SourcePattern>

    </DataSource>

  </DataSources>

  <WriteActions>

    <WriteAction ID="WA" TypeID="Microsoft.Forefront.TMG.Rule.AlertGenerate.WA">

      <AlertMessageId>$MPElement[Name="Microsoft.Forefront.TMG.Network_Load_Balancing_cannot_be_configured_properly_because_there_is_no_suitable_network_adapter.AlertMessage"]$</AlertMessageId>

      <DomainName>$Target/Host/Host/Property[Type="Windows!Microsoft.Windows.Computer"]/DomainDnsName$</DomainName>

      <Priority>1</Priority>

      <Severity>2</Severity>

    </WriteAction>

  </WriteActions>

</Rule>