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.
i never had issues with my slingbox until recently. the video and sound come out fine but the remote functions dont work at all. i selected the correct carrier and model of my cable box and followed the install instructions and refreshed it several times. any help?