You have to install the SQL Server Native Client Software:-(
and check or set the client configuration.
https://technet.microsoft.com/en-us/library/ms191187%28v=sql.120%29.aspx
You do not need to configure a fixed type of connection, this can be done via DBParm etc.
PB 12.5 Connection to a Sql Server 2012 using SNC
In a Bind with DisableBind!! | SCN
hth
Arnd