It seems that you are having some issues with your Slingbox since you cannot connect to your network through the Wi-Fi connection.
Most of the times, SlingPlayer tries to go outside yur network and go back into your network to connect with your Slingbox. Many routers don't allow this kind of network traffic. The following article will provide you with further details and a workaround that will allow you to fix this issue:
Hope this helps!