DRA Web Consol's AppPool in IIS won't start when installed on a machine also running Exchange 2010

  • 7018814
  • 19-Apr-2017
  • 21-Apr-2017


NetIQ Directory & Resource Administrator 9.0.x


The DRA Web Consol's AppPool in IIS won't start when installed on a machine also running Exchange 2010.
DRA AppPool and Exchange compatibility issues


When attempting to start the DRA App Pool in IIS and access the DRA Web site, the following entries may appear in the Application log due to the App Pool not starting:


The Module DLL 'D:\Program Files\Microsoft\Exchange Server\V14\Bin\kerbauth.dll' could not be loaded due to a configuration problem. The current configuration only supports loading images built for a x86 processor architecture. The data field contains the error number. To learn more about this issue, including how to troubleshooting this kind of processor architecture mismatch error, see http://go.microsoft.com/fwlink/?LinkId=29349.


You may also see this entry in the System log:


A listener channel for protocol 'http' in worker process '7336' serving application pool 'DRAAppPool' reported a listener channel failure.  The data field contains the error number.


This is a known compatibility issue where 32-bit App pools, like the one DRA's Web Console uses are not always compatible on the same servers with Exchange 2010 installed.  This issue can be encountered if you have a DRA server running with Exchange 2010 also installed. 
To resolve this issue, you will need to modify the C:\Windows\System32\inetsrv\config\applicationHost.config.  You will need to add "preCondition="bitness64" for owaauth Airfilter.dll and <filter name="Exchange OWA Cookie Authentication ISAPI Filter" path="D:\Program Files\Microsoft\Exchange Server\V14\ClientAccess\owa\auth\owaauth.dll" enabled="true"  preCondition="bitness64" />

                <filter name="Exchange ActiveSync ISAPI Filter" path="D:\Program Files\Microsoft\Exchange Server\V14\ClientAccess\sync\bin\AirFilter.dll" enabled="true" preCondition="bitness64"/>


Under GlobalModules make sure you have the following line:


<add name="kerbauth" image="D:\Program Files\Microsoft\Exchange Server\V14\Bin\kerbauth.dll" preCondition="bitness64" />


When you load DRA Web console you will get an error message about it not being able to load a DLL  Find that DLL in the applicationHost.config file and add the preCondition="bitness64" to it.  Then, restart IIS.