Trying to use the new Add-in for Analysis Services in Excel 2003, running on
Win XP SP1.
Trying to connect the Add-in to AS via http.
I get the following error: "OLAP Server error: Unspecified error"

However, when I connect to the same AS, also via http, this time using the
regular Excel menu (Data, Import External Data, Import Data... etc..), I can
connect without a problem.

What is different about this new add-in that prevents me to connect to my
Analysis Server?