Sql Server 2008 Reporting Security issue ( added name to Server, some how cannot acces the report ) getting error message

Question

have added name to Sql server , users cannot access the report, getting error message ,
I have give all the permission to this users, so why this users still cannot look at the report,
and getting error message,
An error has occurred during report processing.
cannot create a connection to data source Ax live
for more information about this error navigate to the report server on the local server machine or enable remote errors.
can some please help me what this message means,
I really appreciate it
thanks In advance

Answer 1

If "Credentials supplied by the user running the report" is selected, when the report is run, the user will be prompted to provide credentials.  They would need to provide credentials that have the appropriate permissions (e.g., read, execute) to the
database.  This prevents the double hop.
If "Credentials stored securely in the report server" is selected, you have to enter the username and password of a user (or service account) that has the appropriate permissions (e.g., read, execute) to the database. When the report is run, SSRS will use
these stored credentials each time to authenticate to the database engine and query the data.  Users running the report are not prompted to provide credentials.  With this option you can use an Active Directory or SQL Server account.
In order to access/run the report, a user will need to authenticate to SSRS.  There are options here as well. You can provide them the link to the report manager and they can authenticate, navigate to, and run the report.  You can also provide
direct links to reports that users click in a document or application.  At this point the user is typically still prompted to authenticate to SSRS.  You can also programmatically call the report using API's and essentially build a proxy that authenticates
to SSRS and open the report.
Not sure if that answers your question.