Porque estás usando el puerto 1957?
Ya intentaste con el puerto 1433, intenta éstos pasos
Cita: Go to All Programs -> Microsoft SQL Server 2008 -> Configuration Tools -> SQL Server Configuration Manager.
Now Sql Server Configuration manager window will appear. Expand SQL Server Netwoek Configuration, select Protocol for MSSQLSERVER & right click on TCP/IP in detail pane go to property and Select IP Address tab. Select in
IP1=> Active=Yes, Enabled=Yes,IP Address =<machine ip address>, TCP Dynamic Port=Empty, TCP Port=1433
IP2=> Active=Yes, Enabled=Yes,IP Address =127.0.0.1, TCP Dynamic Port=Empty, TCP Port=1433
IP3=> TCP Dynamic Port=Empty, TCP Port=1433
Referencia
http://forums.asp.net/t/1338911.aspx/2/10
Salu2