Fail to add VBox 3442 discovery from Plex docker, i.e. VBox DVR manual search bug

Hi,
I bought the recommended tunner from Plex supported tunners support page VBox 3442 linked below. I’m using its latest firmware XTI_VJ.2.66.20.
Plex Windows server is able to successfully discover it from the same subnet, without introducing manually the IP, and it is detected as: VBox Communications VBox TV Gateway http://192.168.1.135:5555
However, if I try to run a manual search for that device IP, it fails.

This impacts me in the following way; i’m trying to migrate my plex to a docker in my server. In that plex server, automatic discovery is not occurring. I don’t want to change the container to host, plus, I’ve already configured it so that the container can reach without issues the Tuner IP. Also, when trying to to directly input the IP of the tunner, the search says it fails to find anything (just like in the windows plex).
I checked the logs and seems like Plex tries to find a http://192.168.1.135:55555/discover.json file in my tuner, which just doesn’t exist, so it fails to proceed manually. However, the same seems not to bother the automatic discovery of the same from the other plex.

  • Why manually setting the same IP, or IP:Port of the tuner will fail to be added for VBox Tuners, although they are listed as supported tunners?
  • How can we manually add a VBox TV Tunner?

Server Version#: 1.32.6.7557
Player Version#: Any, but 4.108.0
Tuner Make/Model: https://www.vboxcomm.eu/vbox-tv-gateway-for-terrestrial-dvb-t-t2-xti-3442/
Guide/Lineup name: N/A but plex itself.
Using XMLTV?: N/A, but no.
Channel number/Name: N/A, but all.

Logs (both from automatic and manual search):

Nov 02, 2023 12:50:27.675 [548225327328] Depuración — [Req#23a2b] DVR:Device: Discovering and refreshing all devices.
Nov 02, 2023 12:50:27.676 [548225327328] Depuración — [Req#23a2b] Grabber: HDHomerun discovered 0 compatible devices.
Nov 02, 2023 12:50:27.676 [548225327328] Depuración — [Req#23a2b/HCl#898] HTTP requesting POST http://127.0.0.1:32600/devices/discover
Nov 02, 2023 12:50:30.616 [548285108448] Depuración — [HttpClient/HCl#898] HTTP/1.1 (2.9s) 200 response from POST http://127.0.0.1:32600/devices/discover
Nov 02, 2023 12:50:30.618 [548316631264] Depuración — Completed: [192.168.1.26:59437] 200 POST /media/grabbers/devices/discover (10 live) #23a2b TLS GZIP 2944ms 479 bytes (pipelined: 11)
Nov 02, 2023 12:50:30.712 [548211781856] Depuración — Request: [192.168.1.26:59437 (WAN)] POST /media/grabbers/tv.plex.grabbers.hdhomerun/devices?uri=http%3A%2F%2F192.168.1.135%3■■■555 (10 live) #23a38 TLS GZIP Signed-in Token (diamant-x) (Microsoft Edge)
Nov 02, 2023 12:50:30.713 [548211781856] Depuración — [Req#23a38] Grabber: Checking device URI http://192.168.1.135:55555
Nov 02, 2023 12:50:30.714 [548211781856] Depuración — [Req#23a38/HCl#899] HTTP requesting GET http://192.168.1.135:55555/discover.json
Nov 02, 2023 12:50:30.904 [548285108448] Depuración — [HttpClient/HCl#899] HTTP/1.1 (0.2s) 404 response from GET http://192.168.1.135:55555/discover.json
Nov 02, 2023 12:50:30.907 [548211781856] Depuración — [Req#23a38] JSON parse error: Invalid value. (0)
Nov 02, 2023 12:50:30.907 [548211781856] Error — [Req#23a38] Grabber: No tuner key exists for device, couldn't obtain device status.
Nov 02, 2023 12:50:30.908 [548318740704] Depuración — Completed: [192.168.1.26:59437] 404 POST /media/grabbers/tv.plex.grabbers.hdhomerun/devices?uri=http%3A%2F%2F192.168.1.135%3■■■555 (10 live) #23a38 TLS GZIP 195ms 508 bytes (pipelined: 12)
Nov 02, 2023 12:50:33.350 [548225327328] Depuración — [Req#23a47] DVR:Device: Discovering and refreshing all devices.
Nov 02, 2023 12:50:33.351 [548225327328] Depuración — [Req#23a47] Grabber: HDHomerun discovered 0 compatible devices.
Nov 02, 2023 12:50:33.352 [548225327328] Depuración — [Req#23a47/HCl#89a] HTTP requesting POST http://127.0.0.1:32600/devices/discover
Nov 02, 2023 12:50:35.803 [548285108448] Depuración — [HttpClient/HCl#89a] HTTP/1.1 (2.5s) 200 response from POST http://127.0.0.1:32600/devices/discover (reused)

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