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An asynchronous LDAP call has failed.

An_asynchronous_LDAP_call_has_failed (Rule)

Knowledge Base article:

Summary

An Exchange component performed an asynchronous Lightweight Directory Access Protocol (LDAP) search that failed. In absence of other events, this event usually means that there is a problem with a particular user or operation. Overall mail flow should not be affected.

Sample Event:

Event Type: Error

Event Source: MSExchangeDSAccess

Event Category: None

Event ID: 2049

Description: Process INETINFO.EXE (PID=1032). An asynchronous LDAP call failed - Error code=80040934. Base DN=,Filter=(&(mailNickName=platmember1436)(objectClass=user)), Scope=2

Causes

Resolutions

Look for accompanying events. You may need to turn up logging for the Topology category. You can do it by launching Exchange System Manager, right-clicking the server and choosing DSAccess on the Diagnostics Logging tab.

External

For more information about MSExchangeDSAccess event 2049, see:

Element properties:

TargetMicrosoft.Exchange.ExchangeComponent.IS
CategoryEventCollection
EnabledTrue
Event_ID2049
Event SourceMSExchangeDSAccess
Alert GenerateTrue
Alert SeverityWarning
Alert PriorityNormal
RemotableTrue
Alert Message
An asynchronous LDAP call has failed.
{0}
Event LogApplication

Member Modules:

ID Module Type TypeId RunAs 
EventDS DataSource Microsoft.Windows.EventProvider Default
GenerateAlert WriteAction System.Health.GenerateAlert Default

Source Code:

<Rule ID="An_asynchronous_LDAP_call_has_failed" Enabled="onEssentialMonitoring" Target="Exch2003Core!Microsoft.Exchange.ExchangeComponent.IS" ConfirmDelivery="false" Remotable="true" Priority="Normal" DiscardLevel="100">

  <Category>EventCollection</Category>

  <DataSources>

    <DataSource ID="EventDS" TypeID="Windows!Microsoft.Windows.EventProvider">

      <ComputerName>.</ComputerName>

      <LogName>Application</LogName>

      <Expression>

        <And>

          <Expression>

            <SimpleExpression>

              <ValueExpression>

                <XPathQuery>Channel</XPathQuery>

              </ValueExpression>

              <Operator>Equal</Operator>

              <ValueExpression>

                <Value>Application</Value>

              </ValueExpression>

            </SimpleExpression>

          </Expression>

          <Expression>

            <SimpleExpression>

              <ValueExpression>

                <XPathQuery>PublisherName</XPathQuery>

              </ValueExpression>

              <Operator>Equal</Operator>

              <ValueExpression>

                <Value>MSExchangeDSAccess</Value>

              </ValueExpression>

            </SimpleExpression>

          </Expression>

          <Expression>

            <SimpleExpression>

              <ValueExpression>

                <XPathQuery>EventDisplayNumber</XPathQuery>

              </ValueExpression>

              <Operator>Equal</Operator>

              <ValueExpression>

                <Value>2049</Value>

              </ValueExpression>

            </SimpleExpression>

          </Expression>

        </And>

      </Expression>

    </DataSource>

  </DataSources>

  <WriteActions>

    <WriteAction ID="GenerateAlert" TypeID="SystemHealth!System.Health.GenerateAlert">

      <Priority>1</Priority>

      <Severity>1</Severity>

      <AlertOwner>$Data/PublisherName$</AlertOwner>

      <AlertMessageId>$MPElement[Name="An_asynchronous_LDAP_call_has_failed.AlertMessage"]$</AlertMessageId>

      <AlertParameters>

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

      </AlertParameters>

      <Suppression>

        <SuppressionValue/>

      </Suppression>

    </WriteAction>

  </WriteActions>

</Rule>