While executing Federation Extensions for SharePoint 3.0 on Windows Server 2003, the utility fails with the following error: ID1013: Could not access the server hosting the WS-Federation metadata document. Object Identifier (OID) is unknown
This is related to SHA2 support on Windows Server 2003.
Please see the following article for resolution:
Ed Price - MSFT edited Revision 7. Comment: Made link active and white space issues
Ed Price MSFT edited Revision 3. Comment: Minor title and formatting edits.