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Web Infrastructure: Unable to reach indicated web server

Microsoft.LS.2013.Monitoring.UnitMonitor.PairedEvent.WebInfra.WEBINFRA_COMMUNICATION_FAILURE_TO_NEXT_HOP (UnitMonitor)

Knowledge Base article:

Summary

The server selected for next hop could not be reached, or did not reply.

Causes

The remote server may be experiencing problems or the network is not available between these servers.

Resolutions

Examine the event logs on the indicated server to determine the cause of the problem.

Element properties:

TargetMicrosoft.LS.2013.Dependency.WebInfra.ApplicationPool
Parent MonitorSystem.Health.AvailabilityState
CategoryAvailabilityHealth
EnabledTrue
Alert GenerateTrue
Alert SeverityError
Alert PriorityNormal
Alert Auto ResolveTrue
Monitor TypeMicrosoft.LS.2013.MonitorType.PairedEvent.Simple
RemotableTrue
AccessibilityPublic
Alert Message
[LYNC] The server selected for next hop could not be reached, or did not reply.
{0}

Please see the 'Product Knowledge' and the 'Alert Context' tab on Alert Properties view for more information.
RunAsDefault

Source Code:

<UnitMonitor ID="Microsoft.LS.2013.Monitoring.UnitMonitor.PairedEvent.WebInfra.WEBINFRA_COMMUNICATION_FAILURE_TO_NEXT_HOP" Accessibility="Public" Enabled="true" Target="Microsoft.LS.2013.Dependency.WebInfra.ApplicationPool" ParentMonitorID="Health!System.Health.AvailabilityState" Remotable="true" Priority="Normal" TypeID="Microsoft.LS.2013.MonitorType.PairedEvent.Simple" ConfirmDelivery="true">

  <Category>AvailabilityHealth</Category>

  <AlertSettings AlertMessage="Alert_The_server_selected_for_next_hop_could_not_be_reached__or_did_not_reply.">

    <AlertOnState>Error</AlertOnState>

    <AutoResolve>true</AutoResolve>

    <AlertPriority>Normal</AlertPriority>

    <AlertSeverity>Error</AlertSeverity>

    <AlertParameters>

      <AlertParameter1>$Data/Context/EventDescription$</AlertParameter1>

    </AlertParameters>

  </AlertSettings>

  <OperationalStates>

    <OperationalState ID="Microsoft.LS.2013.Monitoring.UnitMonitor.PairedEvent.WebInfra.WEBINFRA_COMMUNICATION_FAILURE_TO_NEXT_HOP.Success" MonitorTypeStateID="SuccessEventRaised" HealthState="Success"/>

    <OperationalState ID="Microsoft.LS.2013.Monitoring.UnitMonitor.PairedEvent.WebInfra.WEBINFRA_COMMUNICATION_FAILURE_TO_NEXT_HOP.Error" MonitorTypeStateID="ErrorEventRaised" HealthState="Error"/>

  </OperationalStates>

  <Configuration>

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

    <LogName>Lync Server</LogName>

    <SuccessExpression>

      <Or>

        <Expression>

          <And>

            <Expression>

              <SimpleExpression>

                <ValueExpression>

                  <XPathQuery Type="UnsignedInteger">EventDisplayNumber</XPathQuery>

                </ValueExpression>

                <Operator>Equal</Operator>

                <ValueExpression>

                  <Value Type="UnsignedInteger">4107</Value>

                </ValueExpression>

              </SimpleExpression>

            </Expression>

            <Expression>

              <SimpleExpression>

                <ValueExpression>

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

                </ValueExpression>

                <Operator>Equal</Operator>

                <ValueExpression>

                  <Value Type="String">LS Web Components Server</Value>

                </ValueExpression>

              </SimpleExpression>

            </Expression>

            <Expression>

              <SimpleExpression>

                <ValueExpression>

                  <XPathQuery Type="String">Params/Param[1]</XPathQuery>

                </ValueExpression>

                <Operator>Equal</Operator>

                <ValueExpression>

                  <Value Type="String">$Target/Property[Type="Microsoft.LS.2013.Dependency"]/Id$</Value>

                </ValueExpression>

              </SimpleExpression>

            </Expression>

          </And>

        </Expression>

        <Expression>

          <And>

            <Expression>

              <SimpleExpression>

                <ValueExpression>

                  <XPathQuery Type="UnsignedInteger">EventDisplayNumber</XPathQuery>

                </ValueExpression>

                <Operator>Equal</Operator>

                <ValueExpression>

                  <Value Type="UnsignedInteger">4110</Value>

                </ValueExpression>

              </SimpleExpression>

            </Expression>

            <Expression>

              <SimpleExpression>

                <ValueExpression>

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

                </ValueExpression>

                <Operator>Equal</Operator>

                <ValueExpression>

                  <Value Type="String">LS Web Components Server</Value>

                </ValueExpression>

              </SimpleExpression>

            </Expression>

          </And>

        </Expression>

      </Or>

    </SuccessExpression>

    <ErrorExpression>

      <And>

        <Expression>

          <SimpleExpression>

            <ValueExpression>

              <XPathQuery Type="UnsignedInteger">EventDisplayNumber</XPathQuery>

            </ValueExpression>

            <Operator>Equal</Operator>

            <ValueExpression>

              <Value Type="UnsignedInteger">4106</Value>

            </ValueExpression>

          </SimpleExpression>

        </Expression>

        <Expression>

          <SimpleExpression>

            <ValueExpression>

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

            </ValueExpression>

            <Operator>Equal</Operator>

            <ValueExpression>

              <Value Type="String">LS Web Components Server</Value>

            </ValueExpression>

          </SimpleExpression>

        </Expression>

        <Expression>

          <SimpleExpression>

            <ValueExpression>

              <XPathQuery Type="String">Params/Param[1]</XPathQuery>

            </ValueExpression>

            <Operator>Equal</Operator>

            <ValueExpression>

              <Value Type="String">$Target/Property[Type="Microsoft.LS.2013.Dependency"]/Id$</Value>

            </ValueExpression>

          </SimpleExpression>

        </Expression>

      </And>

    </ErrorExpression>

  </Configuration>

</UnitMonitor>