For those who have SSRS 2008 R2 DataCenter edition RTM, you might quickly run into this bug when you are configuring remote catalog using the configuration tool: The feature: "Remote access to report data sources and/or the report server database"...

SSRS 2008 R2 native mode share the same authn/authz infrastructure with SSRS 2008. A couple of small modifications to the SSRS 2008 instructions will make it work on R2: Install path change: make sure you are modifying files in the right folder...