I have a farm of IIS servers running Exchange and we are getting this error in HTTP Error:

HTTP/1.1 POST /ews/exchange.asmx - 1 Connection_Dropped_List_Full MSExchangeServicesAppPool

The advice from MSFT is to increase the app pool queue length from 1,000 to 10,000

How do I change IIS's MSExchangeServicesAppPool to a new value via the command line

2 Answers 2


The correct syntax can be found on IIS.NET site.

To change the queue length you would have to enter:

appcmd.exe set APPPOOL "DefaultAppPool" /add.queueLength:10000

in your case:

appcmd.exe set APPPOOL "MSExchangeServicesAppPool" /add.queueLength:10000

You can list the current configuration settings with:

appcmd.exe list APPPOOL "MSExchangeServicesAppPool" /text:*

Hope this helps.


I don't have a way to test this right now, so this might not work. That said you might be able to change this using appcmd (http://www.iis.net/learn/get-started/getting-started-with-iis/getting-started-with-appcmdexe) to change the queue length - it's in applicationHost.config (http://www.iis.net/configreference/system.applicationhost/applicationpools/add)

for example

%systemroot%\system32\inetsrv\APPCMD set apppool "MyAppPool" /add.queueLength 10000
  • Nearly got it right.
    – John K. N.
    Apr 7, 2014 at 13:43

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