I've used connectionstrings.com once or twice to resolve problems connecting to databases.
There are sections for most of the major DBs as well as using Excel files!
'dbmssocn'
The network library used to establish a connection to an instance of SQL Server. Supported values include dbnmpntw (Named Pipes), dbmsrpcn (Multiprotocol, Windows RPC), dbmsadsn (Apple Talk), dbmsgnet (VIA), dbmslpcn (Shared Memory, local machine only) and dbmsspxn (IPX/SPX), dbmssocn (TCP/IP) and Dbmsvinn (Banyan Vines).
The corresponding network DLL must be installed on the system to which you connect. If you do not specify a network and you use a local server (for example, "." or "(local)"), shared memory is used.