When you install Sage CRM 7.0 and 7.1 on 2008 R2 or SBS 2011 you might have issue : http error 503 service unavailable.

You will notice the CRM App Pool and the CRMRewriter App pool is stopped.

In the Event log you will have an event id : 2282

IIS-W3SV-WP

The  module DLL ‘C:program filesMicrosoftExchanger ServerV14Binkerbauth.dll’ could not be loaded due to a configuration problem. The current configuration only supports loading images built for a x86 processor architecture.

This might occurred with several DLL.

The kerbauth.dll only work 64 bit.

In the applicationHost.config file for IIS (located in C:WindowsSystem32inetsrvconfig). Stop IIS and edited the file. In the globalModules section, add at the end of the line for kerbauth, and added the precondition=”bitness64” attribute as follows:

<add name=”kerbauth” image=”C:Program FilesMicrosoftExchange ServerV14Binkerbauth.dll” preCondition=”bitness64″ />

Those DLL might need the same :

Both were listed in the <isapiFilters> section of the applicationHost.config file:

<filter name=”Exchange OWA Cookie Authentication ISAPI Filter” path=”C:Program FilesMicrosoftExchange ServerV14ClientAccessowaauthowaauth.dll” enabled=”true” preCondition=”bitness64″ />

<filter name=”Exchange ActiveSync ISAPI Filter” path=”C:Program FilesMicrosoftExchange ServerV14ClientAccesssyncbinAirFilter.dll” enabled=”true” preCondition=”bitness64″ />

Restart IIS and CRM.