i disconnected the jumpers.
actually the shield version i have can not directly sit on top of mega. i am using custom made small pin wires to make the connections. i have few of these wires so i'm only connecting following pins (10, 11, 12, 13, AREF, IOREF, RESET and ICSP header pins). Do i need to connect all the pins to make it work?
arduino serial monitor doesn't show any client connection when i made request from browser or from C# app.