Created Unassigned: SQL Server Connectivity Issue [43626]

From Visual FoxPro 9 , I am trying to connect SQL Server and doing some CRUD action. It is working fine in some client , while not working in some client.
I have checked following :-

1) Most of client with Window XP/WIndow 7 Ulitimate can connect well. Only some client are not working .
2) Through ODBC, OLE Db conectivity is ok , (Means no firewall issue in client)


Server side configuration:-
OS - Window Server 2012 R2
SQL - SQL Server 2014 express edition

Error getting when trying to connect :-
[Microsoft] [ODBC SQL SERVER DRIVER] [TCP/IP SOCKETS] Sql server does not exist or access denied.

Any help can be appreciated.


Hardik.