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An unsupported legacy host was discovered on the network

Microsoft.Windows.NetworkLoadBalancing.6.2.An.unsupported.legacy.host.was.discovered.on.the.network (Rule)

Knowledge Base article:

Summary

Hosts in a Network Load Balancing (NLB) cluster are configured to load balance network traffic. Host configuration is set by using NLB Manager, and if it is not configured properly, the NLB cluster may not function correctly.

Resolutions

Remove deprecated host

If an unsupported legacy host is discovered on the Network Load Balancing (NLB) cluster, you should remove the legacy host from the cluster. The cluster will remain in a converging state until all deprecated legacy hosts are removed.

To remove the host from an NLB cluster:

Element properties:

TargetMicrosoft.Windows.NetworkLoadBalancing.6.2.ServerRole
CategoryAlert
EnabledTrue
Alert GenerateFalse
RemotableTrue

Member Modules:

ID Module Type TypeId RunAs 
DS DataSource Microsoft.Windows.NetworkLoadBalancing.EventProvider Default
WA WriteAction Microsoft.Windows.NetworkLoadBalancing.6.2.GenerateAlert.SuppressByDescription Default
WriteToDB WriteAction Microsoft.Windows.NetworkLoadBalancing.6.2.CollectEvent Default

Source Code:

<Rule ID="Microsoft.Windows.NetworkLoadBalancing.6.2.An.unsupported.legacy.host.was.discovered.on.the.network" Enabled="onEssentialMonitoring" Target="Microsoft.Windows.NetworkLoadBalancing.6.2.ServerRole" ConfirmDelivery="true" Remotable="true" Priority="Normal" DiscardLevel="100">

  <Category>Alert</Category>

  <DataSources>

    <DataSource ID="DS" TypeID="NLBLibrary!Microsoft.Windows.NetworkLoadBalancing.EventProvider">

      <Criteria>

        <SimpleExpression>

          <ValueExpression>

            <XPathQuery>EventDisplayNumber</XPathQuery>

          </ValueExpression>

          <Operator>Equal</Operator>

          <ValueExpression>

            <Value>97</Value>

          </ValueExpression>

        </SimpleExpression>

      </Criteria>

    </DataSource>

  </DataSources>

  <WriteActions>

    <WriteAction ID="WA" TypeID="Microsoft.Windows.NetworkLoadBalancing.6.2.GenerateAlert.SuppressByDescription">

      <Priority>1</Priority>

      <Severity>2</Severity>

      <AlertMessageId>$MPElement[Name="Microsoft.Windows.NetworkLoadBalancing.6.2.An.unsupported.legacy.host.was.discovered.on.the.network.AlertMessage"]$</AlertMessageId>

      <EnableAlert>true</EnableAlert>

    </WriteAction>

    <WriteAction ID="WriteToDB" TypeID="Microsoft.Windows.NetworkLoadBalancing.6.2.CollectEvent">

      <CollectEvent>false</CollectEvent>

    </WriteAction>

  </WriteActions>

</Rule>