syslog integration (Suricon 2019) throws an error

Hi,

I viewed the recording of Suricon 2019 and tried to add syslog interface 
to ntopng, but it always fails:

[...]

Nov 18 14:23:17 collector ntopng[5983]: 18/Nov/2019 14:23:17 
[Ntop.cpp:1994] Registered interface eth0 [id: 0]
Nov 18 14:23:18 collector ntopng: [main.cpp:239] ERROR: An exception 
occurred during syslog://10.24.64.12:9999 interface creation[19]: No 
such device
Nov 18 14:23:18 collector ntopng[5983]: 18/Nov/2019 14:23:18 
[main.cpp:239] ERROR: An exception occurred during 
syslog://10.24.64.12:9999 interface creation[19]: No such device
Nov 18 14:23:18 collector ntopng[5983]: 18/Nov/2019 14:23:18 
[main.cpp:302] PID stored in file /var/run/ntopng.pid
Nov 18 14:23:18 collector ntopng[5983]: 18/Nov/2019 14:23:18 
[Utils.cpp:592] User changed to ntopng
Nov 18 14:23:18 collector ntopng[5983]: 18/Nov/2019 14:23:18 
[HTTPserver.cpp:1199] Web server dirs 
[/usr/share/ntopng/httpdocs][/usr/share/ntopng/scripts]
Nov 18 14:23:18 collector ntopng[5983]: 18/Nov/2019 14:23:18 
[HTTPserver.cpp:1202] HTTP server listening on 3000

[...]

Nov 18 14:23:18 collector ntopng[5983]: 18/Nov/2019 14:23:18 
[Ntop.cpp:403] Welcome to ntopng x86_64 v.3.8.191111 - (C) 1998-18 ntop.org
Nov 18 14:23:18 collector ntopng[5983]: 18/Nov/2019 14:23:18 
[Ntop.cpp:413] Built on Debian GNU/Linux 9.1 (stretch)


I also tried with latest FreeBSD release which also breaks same way. My 
config looks like this:

#cat /etc/ntopng/ntopng.conf | grep -v "#"

-G=/var/run/ntopng.pid
-i=eth0
-i=syslog://10.24.64.12:9999

Any idea what went wrong?


Best,

Michael