Enabling Remote Errors in SSRS In Ax 2012

By default the remote errors property in SQL Server Reporting Services is set to false, which means error messages in a multi-server environment aren't very detailed.  By enabling remote errors, you will get additional error information returned which is more useful than this:
For more information about this error, navigate to the report server on the local server machine, or enable remote errors.

Option 1 to Enable Remote Errors - DB Engine
1.  Connect to the database engine in SSMS and navigate to the ReportServer database.
2.  Query the ConfigurationInfo table to get familiar with it.  Issue the following query:

USE ReportServer
GO

UPDATE ConfigurationInfo
SET Value = 'True'
WHERE Name = 'EnableRemoteErrors'

Option 2 to Enable Remote Errors - Report Server
This option applies to SQL Server 2008 and newer.
1.  Connect to Reporting Services in SSMS.
2.  Right-click on the server node and go to Properties.
3.  On the Advanced page, set the EnableRemoteErrors property to True.