Arduino Yun connection problems
You have to find IP address of your Yùn on your local network. 
What I do in this case: 
- look on the Home router if you can see your Yùn and it's ip, or,
- there is a sketch in Arduino Ide / exemple / bridge / wifi status which can help you to get ip, or
-  open the Arduino Ide software, upload serialTerminal sketch and open serial monitor. It allows you to access the Linux part of the Yùn and type 'ifconfig' to get the IP from the Yùn.