What XDK version are you using, the latest version is 2571. Can you confirm that you have configured an IP address in your Galileo? From the terminal, type ifconfig to see the IP address of wlan0. Once this is completed, connect manually using the “Add Manual Connection” option. Make sure to enter the correct User Name and Password.
If you are experiencing issues connecting to your board, connect to your board in a serial communication session and type the following:
systemctl enable xdk-daemon systemctl restart xdk-daemon