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WAS failed to create application pool

Microsoft.Windows.InternetInformationServices.2008.WAS.failed.to.create.application.pool (Rule)

Knowledge Base article:

Summary

Web sites and Web applications depend on the availability of Internet Information Services (IIS) application pools. IIS application pools in turn depend on the Windows Process Activation Service (WAS). If WAS is not running or errors occur during the startup or shutdown of an application pool, Web sites and Web applications may not be available.

Resolutions

To resolve this problem, try restarting the Windows Process Activation service. Stopping the WAS service will also stop the World Wide Web Publishing Service (W3SVC) and any other services that depend on WAS. Thus, you may also have to start these other services.

To stop and restart WAS:

Element properties:

TargetMicrosoft.Windows.InternetInformationServices.2008.ApplicationPool
CategoryAlert
EnabledTrue
Alert GenerateTrue
Alert SeverityError
Alert PriorityNormal
RemotableTrue
Alert Message
WAS failed to create application pool
{0}

Member Modules:

ID Module Type TypeId RunAs 
DS DataSource Microsoft.Windows.Server.IIS.2008.WarningAndErrorEventProvider Default
Filter ConditionDetection Microsoft.Windows.InternetInformationServices.2008.ApplicationPool.EventFilter Default
WA WriteAction Microsoft.Windows.Server.IIS.2008.GenerateAlertAction.SuppressedByDescription Default

Source Code:

<Rule ID="Microsoft.Windows.InternetInformationServices.2008.WAS.failed.to.create.application.pool" Enabled="onEssentialMonitoring" Target="Microsoft.Windows.InternetInformationServices.2008.ApplicationPool" ConfirmDelivery="false" Remotable="true" Priority="Normal" DiscardLevel="100">

  <Category>Alert</Category>

  <DataSources>

    <DataSource ID="DS" TypeID="Microsoft.Windows.Server.IIS.2008.WarningAndErrorEventProvider">

      <LogName>System</LogName>

    </DataSource>

  </DataSources>

  <ConditionDetection ID="Filter" TypeID="Microsoft.Windows.InternetInformationServices.2008.ApplicationPool.EventFilter">

    <Expression>

      <And>

        <Expression>

          <SimpleExpression>

            <ValueExpression>

              <XPathQuery>EventDisplayNumber</XPathQuery>

            </ValueExpression>

            <Operator>Equal</Operator>

            <ValueExpression>

              <Value>5101</Value>

            </ValueExpression>

          </SimpleExpression>

        </Expression>

        <Expression>

          <SimpleExpression>

            <ValueExpression>

              <XPathQuery Type="String">PublisherName</XPathQuery>

            </ValueExpression>

            <Operator>Equal</Operator>

            <ValueExpression>

              <Value Type="String">Microsoft-Windows-WAS</Value>

            </ValueExpression>

          </SimpleExpression>

        </Expression>

      </And>

    </Expression>

  </ConditionDetection>

  <WriteActions>

    <WriteAction ID="WA" TypeID="Microsoft.Windows.Server.IIS.2008.GenerateAlertAction.SuppressedByDescription">

      <Priority>1</Priority>

      <Severity>2</Severity>

      <AlertMessageId>$MPElement[Name="Microsoft.Windows.InternetInformationServices.2008.WAS.failed.to.create.application.pool.AlertMessage"]$</AlertMessageId>

    </WriteAction>

  </WriteActions>

</Rule>