SQL 2005 Upgrade to Sp2 gives Error when testing Authentication -Reporting Services fails to Authenticate on Windows Server 2003

Hi

I am installing SQL 2005 SP2 on windows 2003 server. We had installed SQL SERVER 2005 with all features. Now while applying SP2 patch , Authentication fails for Reporting Services i.e. (Instance -> ReportServer) with below error ...

Reporting Services (MSSQLSERVER)      -> HResult 0xE9, Level 16, State 1 Shared Memory Provider: No process is on the other end of the pipe.  Sqlcmd: Error: Microsoft SQL Native Client : Communication link failure.

While for MSSQLSERVER Instance (Database Engine) passes successful for authentication.

Can you please help us to resolve the same issue.

Also using sql management studio i am able to connect to Report service and Database engine successfully,