HDHomerun not found

I just signed up for Plex Pass and decided to try out Live TV. I have Plex running within docker on CentOS7. I have an older dual ATSC HDHomeRun tuner, model HDHR-US.

According to the article that follows, all HDHomeRun devices are supported:
https://support.plex.tv/articles/225877427-supported-dvr-tuners-and-antennas/

However, no matter if I try to automatically find the device or manually enter the IP address, the device is not found (in the case of manual, I see "There was a problem adding the device: " with the appropriate IP address. I looked at the “Plex Tuner Service.log” and see the following:
23:22:22.223 [0x7fa4abfff700] WARN - [W] onetv_factory::DeviceGetListEx. libusb_init returned an error -99
Nov 16, 2018 23:22:24.284 [0x7fa4b09fe700] INFO - [I] web_service_t::process_device_discovery
Nov 16, 2018 23:22:24.284 [0x7fa4b09fe700] INFO - [I] device_reactor_t::get_device_list ()
Nov 16, 2018 23:22:24.284 [0x7fa4b09fe700] INFO - [I] dvb_device_factory_t::get_device_list ()
Nov 16, 2018 23:22:26.287 [0x7fa4b09fe700] INFO - [I] SAT2IP - discover_satip_servers(): no servers found
Nov 16, 2018 23:22:26.692 [0x7fa4b09fe700] INFO - [I] v4l::DeviceGetList_impl. getting v4l device list
Nov 16, 2018 23:22:26.697 [0x7fa4b09fe700] INFO - [I] onetv_factory::DeviceGetListEx >>

I can access the tuner with the HDHomeRun app on the phone without any problems. I also tried it with another media server and it worked without any problems there too.

Any ideas? Thank you in advance, Thomas

Found it . . . it was a firewall issue. Disabling or executing the following rule takes care of it:
sudo iptables -I INPUT 4 -s <HDHomeRun-IP-address> -p udp -m state --state NEW -m udp --sport 65001 -j ACCEPT

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