Herewith the relevant part of comment #3, which has been hidden as I neglected to remove my email footer.
*** eth0, wlan0 on Ubuntu are now named according to https://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames/ user@tommy:~$ sudo darkstat -i wlp3s0 --debug error: illegal argument: "--debug" darkstat 3.0.719 (using libpcap version 1.7.4) user@tommy:~$ sudo darkstat -i wlp3s0 (and enp4s0) Appears to succeed, but http://... and https://localhost:666 and :1666 and http://<local_ip>:666 and :1666 all refuse connections from localhost, even with both ports specifically opened, or with firewall off. Same on Debian 9 with latest updates. Not sure if this is actually a darkstat bug - apologies if not but I can't see what's wrong otherwise. user@tommy:~$ ifconfig enp4s0 Link encap:Ethernet HWaddr 20:6a:8a:97:52:82 UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) Interrupt:17 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:3357 errors:0 dropped:0 overruns:0 frame:0 TX packets:3357 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1 RX bytes:348724 (348.7 KB) TX bytes:348724 (348.7 KB) lxcbr0 Link encap:Ethernet HWaddr 00:16:3e:00:00:00 inet addr:10.0.3.1 Bcast:0.0.0.0 Mask:255.255.255.0 UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) virbr0 Link encap:Ethernet HWaddr 00:00:00:00:00:00 inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0 UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) wlp3s0 Link encap:Ethernet HWaddr 1c:3e:84:56:ca:75 inet addr:192.168.1.151 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::c1e8:4ba3:b6e3:b17/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:413421 errors:0 dropped:0 overruns:0 frame:0 TX packets:247354 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:583629884 (583.6 MB) TX bytes:30079108 (30.0 MB) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1699374 Title: localhost:666 connection refused error? To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/darkstat/+bug/1699374/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs