That issue might be caused by the IP address used by your Edison. You need to access the Edison's console and run the following command: configure_edison --showWiFiIP. This command will show you what IP address your Edison has. That's the IP address you should use in the MCU SDK.
The IP address 192.168.2.15 is the default IP address, and it has be changed if your Edison has another one. Please check the following guide: Creating, building, and working with MCU projects | Intel® Developer Zone. In the section "Connecting Eclipse to a different board" you will find the instructions to change the IP address in the MCU SDK.