TCP Port Check: Host Unreachable

Microsoft.LS.2010.Port.TCPPortCheck.HostUnreachableMonitor (UnitMonitor)

Knowledge Base article:

Summary

The target IP or device could not be reached

Causes

This can happen for a few reasons:

Resolutions

Try the following troubleshooting steps to attempt to fix the problem

Element properties:

TargetMicrosoft.LS.2010.PortWatcher
Parent MonitorMicrosoft.LS.2010.Monitoring.ClusterPortWatcherHealth.Availability
CategoryPerformanceHealth
EnabledTrue
Alert GenerateTrue
Alert SeverityError
Alert PriorityNormal
Alert Auto ResolveTrue
Monitor TypeMicrosoft.LS.2010.Port.TCPPortCheck.HostUnreachable
RemotableTrue
AccessibilityPublic
Alert Message
Host Unreachable
Destination Host is unreachable. A route to the destination was not found. ServerName: {0} Port: {1}
RunAsDefault

Source Code:

<UnitMonitor ID="Microsoft.LS.2010.Port.TCPPortCheck.HostUnreachableMonitor" Accessibility="Public" Enabled="true" Target="Microsoft.LS.2010.PortWatcher" ParentMonitorID="Microsoft.LS.2010.Monitoring.ClusterPortWatcherHealth.Availability" Remotable="true" Priority="Normal" TypeID="Microsoft.LS.2010.Port.TCPPortCheck.HostUnreachable" ConfirmDelivery="false">
<Category>PerformanceHealth</Category>
<AlertSettings AlertMessage="Microsoft.LS.2010.Port.TCPPortCheck.HostUnreachableMonitor.AlertMessage">
<AlertOnState>Error</AlertOnState>
<AutoResolve>true</AutoResolve>
<AlertPriority>Normal</AlertPriority>
<AlertSeverity>Error</AlertSeverity>
<AlertParameters>
<AlertParameter1>$Target/Property[Type="Microsoft.LS.2010.PortWatcher"]/ServerName$</AlertParameter1>
<AlertParameter2>$Target/Property[Type="Microsoft.LS.2010.PortWatcher"]/Port$</AlertParameter2>
</AlertParameters>
</AlertSettings>
<OperationalStates>
<OperationalState ID="OK" MonitorTypeStateID="NoHostUnreachableFailure" HealthState="Success"/>
<OperationalState ID="Error" MonitorTypeStateID="HostUnreachableFailure" HealthState="Error"/>
</OperationalStates>
<Configuration>
<ServerName>$Target/Property[Type="Microsoft.LS.2010.PortWatcher"]/ServerName$</ServerName>
<Port>$Target/Property[Type="Microsoft.LS.2010.PortWatcher"]/Port$</Port>
<IntervalSeconds>300</IntervalSeconds>
</Configuration>
</UnitMonitor>