Cant ping device

Hi All,

I have the same problem: “Could not ping XXXX”

$ ./validate.php

Component Version
LibreNMS 1.64.1-35-gff55be7
DB Schema 2020_05_24_212054_poller_cluster_settings (166)
PHP 7.2.31-1+ubuntu16.04.1+deb.sury.org+1
Python 3.5.2
MySQL 10.0.38-MariaDB-0ubuntu0.16.04.1
RRDTool 1.5.5
SNMP NET-SNMP 5.7.3

====================================

[OK] Composer Version: 1.10.7
[OK] Dependencies up-to-date.
[OK] Database connection successful
[OK] Database schema correct
$

$ fping XXXX
XXXX is alive
$

Any thoughts?

Thank you in advance for your help and understanding.

Kind regards,
J.