After you enable the Reporting Services feature on an existing SQL Server SP1 database, you find that you cannot configure the reporting database, such as an error.
Provider: Named pipe provider error:40-Unable to open a connection to SQL Server
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Workaround:
You need to open SQL Server Configuration Manager, locate the SQL Server network configuration, locate the TCP/IP protocol for the instance project, and modify the static port to 1433.
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You can then connect to SQL Server to configure the reporting database as normal.
This article from "Zeng Hung Xin Technical column" blog, declined to reprint!
Tips:sql Server 2012 Report Server error 40 error