Does the Slingbox 500 recognize an Xfinity cable box manufactured by Pace. The Model # is PX013ANM. I could not find it in the setup for the Slingbox 500.
I assume you have already done a proper Forum Search for your model number in case other people have already answered your question ?
If so and that didn't help then check out this thread: https://community.sling.com/message/10363#10363
Come back if it that doesn't help either.