When you followed the last tutorial did you get the connection established message? Do you see an IP address in the eth0 interface? Type ifconfig for more information. When you tried the manual connection what IP and port you used? What user name and what password? Do you have a password set on the Galileo?
Take a look at Re: XDK will not connect to Galileo Gen2 through Ethernet and make sure you already tried all the suggestions
Have you followed the suggestion of the previous post? Were you able to work with the XDK and the Galileo?