Can't set up DVR (VBox XTi-3452)

Hi there fellow plexians,

I am writing to seek assistance with Plex Live TV & DVR and a TV tuner that I recently acquired. I set up the TV tuner and it does work no problem. I can stream the TV over the network, which I tested on two different PCs. However, I can't seem to set up the Plex Tuner.

Plex does not find the device after a long search and entering the IP address manually does not help either. Plex, quite unhelpfully, states that were was a problem. Great -- not helpful.

So, if any of you would happen to have experience with these VBox devices or faced similar issues with other device, I would much appreciate any help or ideas on how to solve this.

Can't connect to DVR

Plex is enabled on the device as per manufacturer instructions.