DECLARE @key VARCHAR(50), @RegistryPath VARCHAR(200)
IF (SERVERPROPERTY('INSTANCENAME')) IS NULL
BEGIN
SET @RegistryPath='Software\Microsoft\MSSQLServer\MSSQLServer\SuperSocketNetLib\Tcp'
END
ELSE
BEGIN
SET @RegistryPath='Software\Microsoft\Microsoft SQL Server\'+CONVERT(VARCHAR(25),SERVERPROPERTY('INSTANCENAME')) + '\MSSQLServer\SuperSocketNetLib\Tcp'
END
EXEC master.dbo.xp_regread 'HKEY_LOCAL_MACHINE', @RegistryPath, 'tcpPort'