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The reported symptoms seem to be related to the Internet Viewing feature. In this case, we recommend you to check this link:
Internet Viewing Help
Just make sure to select both the UDP and TCP protocols when running the manual configuration in your router settings. This way, you will be able to get the remote connection to your Slingbox when running the SlingPlayer Mobile application on your iPhone Mobile device.
The Slingbox Answers Forum Moderation Team.