After Installing SQL Server 2012 Service Pack the RDL reports do not work

Question

I installed SQL Server 2012 Service Pack on backEnd sharepoint and also on BI Server that host Reporting Service.(Before installation everything was working properly)
After this installation the RDL reports do not open and I receive this error message.
The permissions granted to user 'domain\username' are insufficient for performing this operation. (rsAccessDenied)
I also receive the same error message on changing DataSource, Parameters and subscription.
I should mention that, I am using Reporting Services in the Integration Mode. I want to open and modify RDL reports from SharePoint and inside the SharePoint Document Library.

Answer 1

Hi Hedayat,
Thanks for posting your issue,
To solve this problem you have to grant your SQL Reporting Service Application Pool
Account (whatever is running your SQL Service Application, see Central Admin -> Manage Service Application -> SQL Server Reporting Services)
Full Control to the web application that report is being deployed to in your particular case.
Or you could just use the powershell command below:
$webApp = Get-SPWebApplication –Identity http://yoursharepointapp 
$webApp.GrantAccessToProcessIdentity(“domain\SSRSAccount”) 
Also, check out below mentioned URLs for more details and fixes of this issue
http://paulliebrand.com/2013/09/25/ssrs-and-permissions-granted-to-user-are-insufficient-for-performing-this-operation/
https://social.msdn.microsoft.com/Forums/sqlserver/en-US/4ea477ec-ea12-4a3e-bc33-2fcf9d52b84e/error-rsaccessdenied-nt-authoritynetwork-service-are-insufficient?forum=sqlreportingservices
I hope this is helpful to you, mark it as Helpful.
If this works, Please mark it as Answered.
Regards,
Dharmendra Singh (MCPD-EA | MCTS)
Blog : http://sharepoint-community.net/profile/DharmendraSingh