Troubleshooting - InfoPath Form cannot be displayed error

A The form cannot be displayed because the session state is not available error is received when attempting to open an InfoPath Form in a browser.  This occurs in scenarios where a Web Enabled InfoPath Form connects to a WebService which is located on another server.  The problem is experienced due to the Form not being able to pass the current user's credentials. 

Workaround:

Refer to the following Microsoft links to rectify this problem:

http://blogs.msdn.com/infopath/archive/2006/10/30/the-anatomy-of-a-udc-file.aspx

http://blogs.msdn.com/infopath/archive/2006/10/02/Data-Connections-in-Browser-Forms.aspx 

http://msdn2.microsoft.com/en-us/library/ms771995.aspx