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The number of outstanding requests for guard TargetBackend has exceeded the max limit 150. Current request will be rejected.

11 / 11 / 2016 by Exchange Server 2013 Yorum yok / No Comments

If you get Windows Application Event ID:2002 “The number of outstanding requests for guard TargetBackend (“Your Exchange Server FQDN”) has exceeded the max limit 150. Current request will be rejected.” it means concurrent requests come to your Active Sync and RPC Proxies are more than the default limit 150.

You can increase this limit to avoid related problems by modifying the web.config files for these services.

Exchange Warning Event 2002

Log Name: Application
Source: MSExchange Front End HTTP Proxy
Date: 11.11.2016 08:48:33
Event ID: 2002
Task Category: Core
Level: Warning
Keywords: Classic
User: N/A
Computer: Your Exchange Server FQDN
Description:
[Eas] The number of outstanding requests for guard TargetBackend(“istturexc01.vphq.veripark.com”) has exceeded the max limit 150. Current request will be rejected.
Event Xml:
<Event xmlns=”http://schemas.microsoft.com/win/2004/08/events/event”>
<System>
<Provider Name=”MSExchange Front End HTTP Proxy” />
<EventID Qualifiers=”32768″>2002</EventID>
<Level>3</Level>
<Task>1</Task>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime=”2016-11-11T05:48:33.000000000Z” />
<EventRecordID>32916912</EventRecordID>
<Channel>Application</Channel>
<Computer>Your Exchange Server FQDN</Computer>
<Security />
</System>
<EventData>
<Data>Eas</Data>
<Data>TargetBackend(“Your Exchange Server FQDN”)</Data>
<Data>150</Data>
</EventData>
</Event>

To Increase

Edit the Drive:\Exchange Server\V15\FrontEnd\HttpProxy\sync\web.config file and add this key

    <add key=”HttpProxy.ConcurrencyGuards.TargetBackendLimit” value=”2000″ />

in the <appSettings> node

Edit the Drive:\Exchange Server\V15\FrontEnd\HttpProxy\rpc\web.config file and add this key

<add key=”HttpProxy.ConcurrencyGuards.TargetBackendLimit” value=”2000″ />

in the <appSettings> node.

And Recycle the MSExchangeSyncAppPool and MSExchangeRPCProxyAppPool Application Pools in IIS manager to activate the change.

exchange target backend limit

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