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SIP Proxy: Unexpected DNS host name query failures

Microsoft.LS.2019.Monitoring.UnitMonitor.TimerResetEvent.Registrar.SIPPROXY_E_UNEXPECTED_DNS_HOST_FAILURE (UnitMonitor)

Knowledge Base article:

Summary

Skype for Business Server has encountered DNS host name query failures for a peer server that is still configured.

Causes

There may be problems in the DNS infrastructure.

Resolutions

Check that DNS services are functioning correctly. If the identified server is no longer deployed then consider removing it from the local configuration.

Element properties:

TargetMicrosoft.LS.2019.Component.Registrar
Parent MonitorSystem.Health.AvailabilityState
CategoryAvailabilityHealth
EnabledTrue
Alert GenerateTrue
Alert SeverityError
Alert PriorityHigh
Alert Auto ResolveTrue
Monitor TypeMicrosoft.LS.2019.MonitorType.TimerResetEvent.Simple
RemotableTrue
AccessibilityPublic
Alert Message
[Skype] Skype for Business Server has encountered DNS host name query failures for a peer server that is still configured.
{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.2019.Monitoring.UnitMonitor.TimerResetEvent.Registrar.SIPPROXY_E_UNEXPECTED_DNS_HOST_FAILURE" Accessibility="Public" Enabled="true" Target="SFBDiscovery!Microsoft.LS.2019.Component.Registrar" ParentMonitorID="Health!System.Health.AvailabilityState" Remotable="true" Priority="Normal" TypeID="Microsoft.LS.2019.MonitorType.TimerResetEvent.Simple" ConfirmDelivery="true">

  <Category>AvailabilityHealth</Category>

  <AlertSettings AlertMessage="Alert_Skype_for_Business_Server_has_encountered_DNS_host_name_query_failures_for_a_peer_server_that_is_still_configured.">

    <AlertOnState>Error</AlertOnState>

    <AutoResolve>true</AutoResolve>

    <AlertPriority>High</AlertPriority>

    <AlertSeverity>Error</AlertSeverity>

    <AlertParameters>

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

    </AlertParameters>

  </AlertSettings>

  <OperationalStates>

    <OperationalState ID="Microsoft.LS.2019.Monitoring.UnitMonitor.TimerResetEvent.Registrar.SIPPROXY_E_UNEXPECTED_DNS_HOST_FAILURE.Timer" MonitorTypeStateID="TimerEventRaised" HealthState="Success"/>

    <OperationalState ID="Microsoft.LS.2019.Monitoring.UnitMonitor.TimerResetEvent.Registrar.SIPPROXY_E_UNEXPECTED_DNS_HOST_FAILURE.Error" MonitorTypeStateID="ErrorEventRaised" HealthState="Error"/>

  </OperationalStates>

  <Configuration>

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

    <LogName>Lync Server</LogName>

    <ErrorExpression>

      <And>

        <Expression>

          <SimpleExpression>

            <ValueExpression>

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

            </ValueExpression>

            <Operator>Equal</Operator>

            <ValueExpression>

              <Value Type="UnsignedInteger">14627</Value>

            </ValueExpression>

          </SimpleExpression>

        </Expression>

        <Expression>

          <SimpleExpression>

            <ValueExpression>

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

            </ValueExpression>

            <Operator>Equal</Operator>

            <ValueExpression>

              <Value Type="String">LS Protocol Stack</Value>

            </ValueExpression>

          </SimpleExpression>

        </Expression>

      </And>

    </ErrorExpression>

    <AutoResolveInterval>1200</AutoResolveInterval>

  </Configuration>

</UnitMonitor>