Different result for passive checks when using host name or IP address

When using a passive check via NSCA, 1st using the host name assigned within Icinga2, 2nd the IP address of the host instead, Icinga shows different behaviour: With the host name the message is processed as expected, with the IP adress Icinga reports, that the service is unknown.

Icinga log:

[2018-11-03 18:54:10 +0100] information/ExternalCommandListener: Executing external command: [1541267650] PROCESS_SERVICE_CHECK_RESULT;192.168.0.1;ping4;0;up
[2018-11-03 18:54:10 +0100] warning/ExternalCommandListener: External command failed: Error: Cannot process passive service check result for non-existent service 'ping4' on host '192.168.0.1'

Expected Behavior

Current Behavior

Possible Solution

Steps to Reproduce (for bugs)

1. 2. 3. 4.

Context

Your Environment

Version used (icinga2 --version): icinga2 - The Icinga 2 network monitoring daemon (version: r2.8.4-1)

Copyright (c) 2012-2017 Icinga Development Team (https://www.icinga.com/) License GPLv2+: GNU GPL version 2 or later http://gnu.org/licenses/gpl2.html This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.

Application information: Installation root: /usr Sysconf directory: /etc Run directory: /run Local state directory: /var Package data directory: /usr/share/icinga2 State path: /var/lib/icinga2/icinga2.state Modified attributes path: /var/lib/icinga2/modified-attributes.conf Objects path: /var/cache/icinga2/icinga2.debug Vars path: /var/cache/icinga2/icinga2.vars PID path: /run/icinga2/icinga2.pid

System information: Platform: Ubuntu Platform version: 16.04.3 LTS (Xenial Xerus) Kernel: Linux Kernel version: 4.4.0-138-generic Architecture: x86_64

Build information: Compiler: GNU 5.3.1 Build host: 9c880c2f42f5

Operating System and version: Linux UltraBlue 4.4.0-138-generic #164-Ubuntu SMP Tue Oct 2 17:16:02 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
Enabled features (icinga2 feature list): Disabled features: compatlog elasticsearch gelf graphite opentsdb statusdata syslog Enabled features: api checker command debuglog ido-mysql influxdb livestatus mainlog notification perfdata
Icinga Web 2 version and modules (System - About):
Config validation (icinga2 daemon -C):
If you run multiple Icinga 2 instances, the zones.conf file (or icinga2 object list --type Endpoint and icinga2 object list --type Zone) from all affected nodes.

Icinga / icinga2