401 Unauthorized error when process attempts to download documents from doc library

Hello,

I am using Sharepoint 2007.  We have a document library which generates an RSS feed which our web site developer uses to make changes to the contents of the web site.  I believe that the web site parses all the metadata out of the RSS feed for inclusion in the web site, and also downloads the document itself from the document library for storage on the web server.  

I just completed rebuilding our SharePoint site on another server, and when we test this import, we get the following message from the web site's CMS console:

"Error retrieving http://myportal.org/MyDocumentLibrary/Filename.pdf : The remote server returned an error: (401) Unauthorized."

The import worked with no problems until I re-installed and re-created our production sharepoint site.

My question is:  what permissions setting am I missing in Sharepoint that would allow this process' user to download documents?  Currently this user has full control on the document library in question.  The user is an administrator on the sharepoint server, and an administrator on the database server.  The user has datareader permissions on the content database.

If I set up anonymous access on the document library in question we still get the access denied error.

What am I missing???

Thanks!
brl