The Permissions Granted To User 'domainusername' Are Insufficient For Performing This Operation. (rsAccessDenied)

Hi,

I wonder if anyone can help me?

I have installed and configured sql server 2005 express edition with advanced services on an xp box, with the aim of using reporting services.

I have set up reporting services successfully using the report manager, with my web services id = netwrokservice.

I can access both the report manager and report url locally, i.e while using localhost anjd on the machine. The problem arises however when i try to access

the reports from another machine, as i get the message:

"The permissions granted to user 'domainusername' are insufficient for performing this operation. (rsAccessDenied)"

when going to for example:

"http://servername/ReportServer/Pages/ReportViewer.aspx?%2fReport1&rs:Command=Render"

I have looked at various sites (including microsoft) in an attempt to find a solution to this and most sites give exmaples of how to configure the full

version of reporting services which i do not have. The things that I have managed to gleam and try are:

- open up security on dir: C:Program FilesMicrosoft SQL ServerMSSQL.2Reporting ServicesReportServer to everyone and allow all access
- added my own username as a new role assigment in the report manager page
- added my own username to the reportserveruser and reportingserviceswebservicesuser roles, as indicated by microft:

http://msdn2.microsoft.com/en-us/library/ms365166.aspx, who state that "Custom authentication extensions and custom role assignments are not supported. You

must map existing Windows domain user and group accounts to predefined role definitions."

Can anyone suggest where to look next as I cannot believe that this should be this difficult?

Many Thanks in advance