Verifique se estes links lhe ajudam:
http://msdn.microsoft.com/pt-br/library/ms365170.aspx
https://social.msdn.microsoft.com/Forums/sqlserver/en-US/52503ad1-8da5-44dc-bc7a-851253e9479b/cannot-connect-to-ssrs-from-ssms-the-rpc-server-is-unavailable
"1. Open Reporting Services Configuration Manager tool from Start menu->All Programs->Microsoft
SQL Server 2008 R2->Configuration Tools->Reporting Services Configuration Manager.
2. Click Database to ensure you have setted up a report server database on the SQL Server, follow http://msdn.microsoft.com/en-us/library/ms156305.aspx for
other configurations. After the configuration, you should be able to access the reporting services."
