SIP Proxy: Critical network related problem

Microsoft.LS.2019.Monitoring.UnitMonitor.PairedEvent.AccessEdge.SIPPROXY_E_CRITICAL_NETWORK_ERROR (UnitMonitor)

Knowledge Base article:

Summary

A serious network related problem is preventing Skype for Business Server from functioning.

Causes

The Skype for Business Server failed to initialize a required network interface.

Resolutions

Review and correct the network configuration, then start the service again.

Element properties:

TargetMicrosoft.LS.2019.Component.AccessEdge
Parent MonitorSystem.Health.ConfigurationState
CategoryConfigurationHealth
EnabledTrue
Alert GenerateTrue
Alert SeverityError
Alert PriorityHigh
Alert Auto ResolveTrue
Monitor TypeMicrosoft.LS.2019.MonitorType.PairedEvent.Simple
RemotableTrue
AccessibilityPublic
Alert Message
[Skype] A serious network related problem is preventing Skype for Business Server from functioning.
{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.PairedEvent.AccessEdge.SIPPROXY_E_CRITICAL_NETWORK_ERROR" Accessibility="Public" Enabled="true" Target="SFBDiscovery!Microsoft.LS.2019.Component.AccessEdge" ParentMonitorID="Health!System.Health.ConfigurationState" Remotable="true" Priority="Normal" TypeID="Microsoft.LS.2019.MonitorType.PairedEvent.Simple" ConfirmDelivery="true">
<Category>ConfigurationHealth</Category>
<AlertSettings AlertMessage="Alert_A_serious_network_related_problem_is_preventing_Skype_for_Business_Server_from_functioning.">
<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.PairedEvent.AccessEdge.SIPPROXY_E_CRITICAL_NETWORK_ERROR.Success" MonitorTypeStateID="SuccessEventRaised" HealthState="Success"/>
<OperationalState ID="Microsoft.LS.2019.Monitoring.UnitMonitor.PairedEvent.AccessEdge.SIPPROXY_E_CRITICAL_NETWORK_ERROR.Error" MonitorTypeStateID="ErrorEventRaised" HealthState="Error"/>
</OperationalStates>
<Configuration>
<ComputerName>$Target/Host/Host/Host/Property[Type="Windows!Microsoft.Windows.Computer"]/NetworkName$</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">14353</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>
</Expression>
<Expression>
<And>
<Expression>
<SimpleExpression>
<ValueExpression>
<XPathQuery Type="UnsignedInteger">EventDisplayNumber</XPathQuery>
</ValueExpression>
<Operator>Equal</Operator>
<ValueExpression>
<Value Type="UnsignedInteger">12288</Value>
</ValueExpression>
</SimpleExpression>
</Expression>
<Expression>
<SimpleExpression>
<ValueExpression>
<XPathQuery Type="String">PublisherName</XPathQuery>
</ValueExpression>
<Operator>Equal</Operator>
<ValueExpression>
<Value Type="String">LS 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">14624</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>
</Configuration>
</UnitMonitor>