InfluxDB won't start UDP listener

Hi,
I have configured a UDP listener, but it doesn’t start. There is no listening process seen in netstat and when I start influxd manually, it doesn’t say anything about UDP in the output. I would post the output and my config right away, but as a new user, I am not allowed… (what kind of stupid rule is this anyway?)

I am using InfluxDB 1.6.4-1 from the repos.influxdata.com/debian. I upgraded to this version from the 1.0.2 found in Debian Stretch repository, where the UDP didn’t work either. The OS is Debian Stretch running in the LXD container.

Thanks for helping me out.
Martin