Problem
System Alive Checker does not work. The "ping'ed" adresses are always shown as OFF.
Solution
From the domoticz documentation:
When running Domoticz without root (recommended), you need to add the correct socket capabilities for this to function properly and restart domoticz (otherwise it will fail silently!):
$ sudo setcap -v cap_net_raw+eip <full qualified name of domoticz executable>
So, I added the capability "cap_net_raw=+eip" in systemd.service
R Status
Code finished.
Tested on my own instance.