Thanks for your advice, but I still get error messages.
Here is some more information that might be helpful.
Versions:
Tvheadend: 4.2.3-39~ge195d1845~xenial
OctopusNet:
1.0.81
Under the menu item "Configuration > DVB Inputs > Muxes", the column "Scan result" shows "fail" everywhere. And I still see the following error messages:
2017-09-03 08:27:40.093 mpegts: 145MHz in DVB-C Network - tuning on SAT>IP DVB-C Tuner #1 (192.168.178.34)
2017-09-03 08:27:40.094 subscription: 0022:"scan" subscribing to mux "145MHz", weight: 2, adapter:"SAT>IP DVB-C Tuner #1 (192.168.178.34)", network:"DVB-C Network", service:"Raw PID Subscription"
2017-09-03 08:27:40.094 mpegts: 322MHz in DVB-C Network - tuning on SAT>IP DVB-C Tuner #2 (192.168.178.34)
2017-09-03 08:27:40.094 subscription: 0023:"scan" subscribing to mux "322MHz", weight: 2, adapter:"SAT>IP DVB-C Tuner #2 (192.168.178.34)", network:"DVB-C Network", service:"Raw PID Subscription"
2017-09-03 08:27:40.102 satip: SAT>IP DVB-C Tuner #1 (192.168.178.34) - RTSP SETUP error -5 (Input/Output Error)[6-404]
2017-09-03 08:27:40.106 satip: SAT>IP DVB-C Tuner #2 (192.168.178.34) - RTSP SETUP error -5 (Input/Output Error)[6-404]
2017-09-03 08:27:45:45.094 mpegts: 322MHz in DVB-C Network - scan no data, failed
2017-09-03 08:27:45:45.094 subscription: 0023:"scan" unsubscribing
2017-09-03 08:27:45:45.094 mpegts: 145MHz in DVB-C Network - scan no data, failed
2017-09-03 08:27:45:45.094 subscription: 0022:"scan" unsubscribing
Do you need more information?