Perform the following steps:
Open "Client Network Utility" from Microsoft SQL Server folder. Open General tab "enabled protocols by order". Make sure TCP/IP does not appear prior to Named Pipe.
Open "Client Network Utility" from Microsoft SQL Server folder. Open "Server alias configurations". Make sure there is not an entry for "." for TCP/IP or Named Pipe or any other protocols.
Open "Server Network Utility" from Microsoft SQL Server folder. Open "Enabled protocols". Make sure there is an entry for "Named Pipes".
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