Reading the orion docs for http clustering, step 3 left me with strange feeling.
 
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Step 3: Configure your cluster islands
Cluster islands are connected to a certain site rather than to a web application and to configure a cluster island, edit the web-site.xml file for the website your web-application is deployed on (for example default-web-site.xml file if you are clustering the default web-application)...
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Currently all the applications we are testing are defined as sub applications of the default-web-site.
 
ie:
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<web-site host="ivan" port="8080" cluster-island="1" display-name="Default Orion WebSite">
 <default-web-app application="default" name="defaultWebApp" />
 
 <frontend host="ivan" port="80" /> 
 
 <web-app application="eservices" name="eservices-web" root="/eservices" />
 <web-app application="sessions" name="sessions-web" root="/sessions" />
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The line that got me thinking was "cluster islands are connected to a certain site rather than to a web application".  Could this be why our web applications are not sharing sessions when in their own directory, yet the same apps *do* share sessions when in the default-web-app directory??

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