I'm using vnc viewer on windows 8. They are connected by wifi module on the same lan. I've used this instruction to solve problem with an update.
I'm using Rpi 2 with Raspbian Jessie and VNC server 5.2.3. I could now access it by VNC "using vncserver :1 on putty" however VNC doesn't show desktop, it just shows grey screen with X cursor.
When I ping the RPi IP from windows, it can ping correctly.