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DNS Unreachable

AP.Remote.Access.Monitor.DA_DNS_HEURISTIC_UNREACHABLE (UnitMonitor)

Some DNS Servers used by DA for name resolution are not responding

Knowledge Base article:

Summary

One or more enterprise DNS servers used by DirectAccess clients for name resolution are not available.

Causes

1. Enterprise DNS servers are not available.

2. ICMP is disabled on enterprise DNS servers

Resolutions

1. Verify network connectivity to DNS servers.

2. Ensure DNS servers are online and responding to name resolution requests.

3. Verify DNS server settings.

Note: Operations status is updated in accordance with the configured refresh interval. Clicking Refresh to manually update status does not update the status of the DNS resolution and ICMP reachability checks.

Element properties:

TargetAP.Remote.Access.Class.DNS
Parent MonitorSystem.Health.AvailabilityState
CategoryCustom
EnabledTrue
Alert GenerateTrue
Alert SeverityError
Alert PriorityNormal
Alert Auto ResolveTrue
Monitor TypeAP.Remote.Access.Monitor.HeuristicMonitorType
RemotableTrue
AccessibilityPublic
Alert Message
DNS unreachable

Error Description - {0}
Error Cause - {1}
Error Resolution - {2}
RunAsDefault

Source Code:

<UnitMonitor ID="AP.Remote.Access.Monitor.DA_DNS_HEURISTIC_UNREACHABLE" Accessibility="Public" Enabled="true" Target="AP.Remote.Access.Class.DNS" ParentMonitorID="Health!System.Health.AvailabilityState" Remotable="true" Priority="Normal" TypeID="AP.Remote.Access.Monitor.HeuristicMonitorType" ConfirmDelivery="true">

  <Category>Custom</Category>

  <AlertSettings AlertMessage="AP.Remote.Access.Monitor.DA_DNS_HEURISTIC_UNREACHABLE_AlertMessageResourceID">

    <AlertOnState>Warning</AlertOnState>

    <AutoResolve>true</AutoResolve>

    <AlertPriority>Normal</AlertPriority>

    <AlertSeverity>Error</AlertSeverity>

    <AlertParameters>

      <AlertParameter1>$Data/Context/DataItem/Property[@Name='ErrorDesc']$</AlertParameter1>

      <AlertParameter2>$Data/Context/DataItem/Property[@Name='ErrorCause']$</AlertParameter2>

      <AlertParameter3>$Data/Context/DataItem/Property[@Name='ErrorResolution']$</AlertParameter3>

    </AlertParameters>

  </AlertSettings>

  <OperationalStates>

    <OperationalState ID="DA_DNS_HEURISTIC_UNREACHABLE_Error" MonitorTypeStateID="Error" HealthState="Error"/>

    <OperationalState ID="DA_DNS_HEURISTIC_UNREACHABLE_Warning" MonitorTypeStateID="Warning" HealthState="Warning"/>

    <OperationalState ID="DA_DNS_HEURISTIC_UNREACHABLE_Success" MonitorTypeStateID="Healthy" HealthState="Success"/>

  </OperationalStates>

  <Configuration>

    <Interval>300</Interval>

    <SyncTime/>

    <ComponentName>Dns</ComponentName>

    <HeuristicId>2147811329</HeuristicId>

    <Debug>false</Debug>

  </Configuration>

</UnitMonitor>