Thanks for posting in the forums! If I understand correctly, you are getting "No Video Signal" when connecting to your Slingbox and this happens both at home and remotely?
Below is a link to an article that may help toubleshoot this issue. Could you please try the recommended troubleshooting steps in this article and respond to us if the issue persists?
Here is the link:
Hope this helps!
The Sling Moderation Team