Hi:
This Tech Support note:
http://support.sas.com/kb/17/247.html
"There is no mechanism to pass the userid and password for the Stored Process to run via single sign-on when using the URL."
The note suggests using other methods to run the stored process: "For example, run the Stored Process via search, the Stored Process navigator, or as a content item on a collection/bookmarks portlet."
For more help with this issue, you might consider contacting Tech Support.
cynthia