authorization error in reporting services on win2003

Hi,
I have just reinstalled Reporting Services on win 2003 server that was
added to a domain and has been renamed. Two strange things happen:
1) In IE I am prompted for an ID and password with a basic security
prompt.
2) After supplying the credentials I get some of the report manager web
page but it has a 401 error instead of the folder and options to manage
projects.

The page looks like this:
Error

The request failed with HTTP status 401: Unauthorized.

Home

The reporting services error log contains the following error:
Unknown!ui!ed8!2/9/2005-20:44:32:: v VERBOSE: User
map'<Users><User><Name>DOMAIN\Administrator</Name><Paths><Path>/reports/Home.aspx</Path><NrReq>1</NrReq></Paths></User></Users>'
Unknown!ui!a24!2/9/2005-20:44:33:: v VERBOSE: User
map'<Users><User><Name>DOMAIN\Administrator</Name><Paths><Path>/reports/Pages/Folder.aspx</Path><NrReq>1</NrReq></Paths></User></Users>'
Unknown!ui!a24!2/9/2005-20:44:34:: e ERROR: The request failed with
HTTP status 401: Unauthorized.
Unknown!ui!a24!2/9/2005-20:44:35:: e ERROR: HTTP status code --> 500

I have not changed any of the config files that are installed.

Thanks for any help in advance,

EricI have no idea, although there if you search Google groups for "sql
2000 reporting services http 401" there are a number of hits which may
be useful. You will probably get a better answer in
microsoft.public.sqlserver.reportingsvcs.

Simon