SAP XI error: 401 Unauthorized (When calling from Enterprise Portal)

Hello Friends
I am trying to access an SAP table from IVIEW of portal via XI. Using the latest and greatest version of all SAP Components. (We just installed couple of weeks back).
I keep getting the following error message when I try to access data from IVIEW of portal.
"SAP XI error: 401 Unauthorized"
What may be the reason? If some one can help me, I would really appreciate it.
Thanks
Ram

Thanks Srinivas for your help.
I tried accessing the URL directly and got the error message
"User Credentials not passed via Enterprise Portal. Please contact your Administrator"
Any more suggestions?
Thanks again
Ram

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