I have a new SQL 2005 reporting services installation and it doesn't work.
Database access works fine.
I've setup a new IIS site, set it to run on port 90. It has the two virtual folders - Reports and ReportServer. I can access ReportServer just fine, but Reports (the report manager) throws HTTP 400 error.
I've changed the URL in rsreportserver.config and RSWebApplication.config but it still throws that error.
I fixed it on another server - the solution is simply to delete the IIS site which holds Report server and report manager, then create a new IIS site, configure IP and port mapping and recreate the virtual directories.