Seems to be a similar problem (on Ubuntu) after installing Digital Devices drivers.
No GUI appears neither with 127.0.0.1:9981 nor 192.168.1.139:9981
At first:
root@tvbung:/home/anton# netstat -an | grep 9981
tcp 0 0 0.0.0.0:9981 0.0.0.0:* LISTEN
tcp 354 0 127.0.0.1:9981 127.0.0.1:35798 CLOSE_WAIT
tcp 358 0 192.168.1.139:9981 192.168.1.139:37678 CLOSE_WAIT
tcp 348 0 192.168.1.139:9981 192.168.1.139:37702 CLOSE_WAIT
tcp 342 0 127.0.0.1:9981 127.0.0.1:35790 CLOSE_WAIT
tcp 358 0 192.168.1.139:9981 192.168.1.139:37680 CLOSE_WAIT
tcp 348 0 192.168.1.139:9981 192.168.1.139:37658 CLOSE_WAIT
tcp 0 0 192.168.1.139:37766 192.168.1.139:9981 ESTABLISHED
tcp 347 0 192.168.1.139:9981 192.168.1.139:37766 ESTABLISHED
Then:
root@tvbung:/home/anton# netstat -an | grep 9981
tcp 0 0 0.0.0.0:9981 0.0.0.0:* LISTEN
tcp 354 0 127.0.0.1:9981 127.0.0.1:35798 CLOSE_WAIT
tcp 358 0 192.168.1.139:9981 192.168.1.139:37678 CLOSE_WAIT
tcp 348 0 192.168.1.139:9981 192.168.1.139:37702 CLOSE_WAIT
tcp 416 0 192.168.1.139:9981 192.168.1.55:54492 ESTABLISHED
tcp 342 0 127.0.0.1:9981 127.0.0.1:35790 CLOSE_WAIT
tcp 0 0 192.168.1.139:9981 192.168.1.55:54493 ESTABLISHED
tcp 358 0 192.168.1.139:9981 192.168.1.139:37680 CLOSE_WAIT
tcp 348 0 192.168.1.139:9981 192.168.1.139:37658 CLOSE_WAIT
tcp 0 0 192.168.1.139:37766 192.168.1.139:9981 ESTABLISHED
tcp 347 0 192.168.1.139:9981 192.168.1.139:37766 ESTABLISHED
root@tvbung:/home/anton# service tvheadend status
● tvheadend.service
Loaded: loaded (/etc/init.d/tvheadend; bad; vendor preset: enabled)
Active: active (running) since Чт 2019-04-25 20:44:59 MSK; 28min ago
Docs: man:systemd-sysv-generator(8)
Process: 11493 ExecStop=/etc/init.d/tvheadend stop (code=exited, status=0/SUCCESS)
Process: 11522 ExecStart=/etc/init.d/tvheadend start (code=exited, status=0/SUCCESS)
CGroup: /system.slice/tvheadend.service
└─11535 /usr/bin/tvheadend -f -u hts -g video
апр 25 20:44:59 tvbung tvheadend[11535]: tcp: No systemd socket: creating a new one
апр 25 20:44:59 tvbung tvheadend[11535]: htsp: Starting HTSP server 0.0.0.0:9982
апр 25 20:44:59 tvbung tvheadend[11535]: config: loaded
апр 25 20:44:59 tvbung tvheadend[11535]: config: scanfile (re)initialization with path <none>
апр 25 20:45:02 tvbung tvheadend[11535]: scanfile: DVB-S - loaded 1 regions with 94 networks
апр 25 20:45:02 tvbung tvheadend[11535]: scanfile: DVB-T - loaded 44 regions with 1104 networks
апр 25 20:45:02 tvbung tvheadend[11535]: scanfile: DVB-C - loaded 17 regions with 53 networks
апр 25 20:45:02 tvbung tvheadend[11535]: scanfile: ATSC-T - loaded 2 regions with 9 networks
апр 25 20:45:02 tvbung tvheadend[11535]: scanfile: ATSC-C - loaded 1 regions with 5 networks
апр 25 20:45:02 tvbung tvheadend[11535]: scanfile: ISDB-T - loaded 2 regions with 1000 networks
The same problem with any other browser on this and other PCs