SSRS 401.3 Error Access Denied Due To Access Control Lists

After uninstalling an Oracle 10 client / security patch (don't know what triggerd it) I'm having trouble with users accessing our SSRS test server. First thing that happened was th

Solution 1:

Solved! After granting the appropriate AD group read & execute rights on C:\Program Files\Microsoft SQL Server\MSRS10_50.MSSQLSERVER\Reporting Services the 401 disappeared!!

My users can connect to the report server and my .NET app can connect to the report service / asmx

Don't know what triggered it and why it's necessary to grant access on the file system but it's a quick relief compared to my alternatives..

Regards,

Mike