I have the same problem. I spent 4 hours phone with Slingbox supplier (29$). After the 2 first hours, they told me that I have probably something on my computer blocking the access. After 1 hr with Apple, checking if there's something wrong ( everything ok), I called back the supplier and spend an other 2hours for what????, I still have the same problem. Next step is to talk to a supervisor, but I missing courage!!!