For a long time (over a year), I've been using the Slingbox app on my iPad and casted to my Chromecast at my office. It worked perfectly this entire time, until around a month ago, where each time I tried to connect to the Chromecast, the TV and the iPad screen display the error message, "Unable to Connect (2)". The Chromecast connects perfectly with other apps, such as the Youtube app or the Twitch app - only the Slingbox app is the issue. This means that the issue is not the router or the iPad or the Chromecast: just the slingbox app. I do not need to port forward either.