I have C# application which manage SQL database. Database is on SQLEXPRESS server. The problem is when i try to connect from another computer in network it does not work. The error is : A network related or instance-specific error.... The SQL The server is set to receive connections. The connection sting is : public string strConnSring = "Data Source=192.168.1.15\\SQLEXPRESS; database=data; Integrated Security=SSPI"; What can be wrong?