DVR : plex server cannot find HDhomerun connect

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PMS on Ubuntu 18.04.2 LTS (Linux), HDHomeRun connect (UK) cannot be found.

I recently re-installed Linux and had to re-install PMS, my old database was destroyed during the upgrade. Previously the HDHR was working perfectly with PMS, but now PMS cannot find it. However, from my MacBook I can see the HDHR and watch live TV fine.

So the problem seems to be with PMS itself. It still has the same (static) IP address as before, and I can see 2 potential issues in the logs, as follows:-

Firstly the console logs are showing the following error every 10 seconds:-

NetworkServiceBrowser: Error sending out discover packet from 192.168.1.200 to 239.255.255.250: Operation not permitted

and secondly, the logs have repeated lines like so:-

Plex Media Server.1.log:Feb 22, 2019 19:14:42.857 [0x7fdd52a2e700] DEBUG - DVR:Device: Discovering and refreshing devices with identifier tv.plex.grabbers.hdhomerun
Plex Media Server.1.log:Feb 22, 2019 19:14:43.126 [0x7fdd52a2e700] DEBUG - DVR:Grabber: HDHomerun discovered a model HDHR4-2DT.
Plex Media Server.1.log:Feb 22, 2019 19:14:43.186 [0x7fdd52a2e700] DEBUG - DVR:Grabber: HDHomerun discovered 1 compatible devices.
Plex Media Server.1.log:Feb 22, 2019 19:14:43.186 [0x7fdd52a2e700] DEBUG - DVR:Device: Testing grabber HDHomerun device device://tv.plex.grabbers.hdhomerun/12317F8D at http://192.168.1.209:80
Plex Media Server.1.log:Feb 22, 2019 19:14:43.186 [0x7fdd52a2e700] DEBUG - DVR:Device: Device device://tv.plex.grabbers.hdhomerun/12317F8D was already known, refreshing database info
Plex Media Server.1.log:Feb 22, 2019 19:14:43.247 [0x7fdd52a2e700] DEBUG - DVR:Device: Device was alive, refreshed device://tv.plex.grabbers.hdhomerun/12317F8D.
Plex Media Server.1.log:Feb 22, 2019 19:15:14.612 [0x7fdd52a2e700] DEBUG - NetworkServiceBrowser: SSDP departed after not being seen for 20.263474 seconds: 192.168.1.209 (HDHomeRun DMS 12317F8D)
Plex Media Server.1.log:Feb 22, 2019 19:15:14.613 [0x7fdd03fff700] DEBUG - DVR:Device: Discovering and refreshing devices with identifier tv.plex.grabbers.hdhomerun
Plex Media Server.1.log:Feb 22, 2019 19:15:14.613 [0x7fdd03fff700] DEBUG - DVR:Grabber: HDHomerun discovered 0 compatible devices.

Does anyone have any ideas? I’m wondering if it’s something to do with multicast (the first error) but it seems more likely to be due to the hdhomerun grabber failing (the 2nd error).

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Turns out this was a self-inflicted injury! I was running a VPN which takes over the main ethernet port and (not surprisingly) re-routes all traffic. Stopping the VPN brought my HDHR back to life as far as PMS was concerned, and now all is good. Apologies to anyone who might have expended any thought on this one, it was entirely my own fault!

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