This message means that the home network connections are not properly established. Once you connect the Slingbox at home, it should not interfere with the TV set normal behavior.
We recommend you to check the home network connections and make sure to connect the Slingbox to the Dish set top box. Just make sure to check the User's Guide in order to know how to get the right connections.
The following link will provide you with the User's Guide in order to check the right connections to make.