Truenas Scale - Zabbix App Problems Fping/ICMP

[Llanelwy]

Hi,

I have just installed the Docker App for Zabbix on my Trunas Scale Homeserver. But i am running into some problems. All ICMP monitoring seems to fail. SNMP works fine however.

I have had a poke about and went into the Shell for the Zabbix app. From the command line Ping works fine. However fping always shows Host Unreachable. Even when trying localhost.

$ bash
zabbix@f501d68535a1:~$ ls
dbscripts enc enc_internal export mibs modules snmptraps ssh_keys ssl
zabbix@f501d68535a1:~$ ping localhost
PING localhost (::1) 56 data bytes
64 bytes from localhost (::1): icmp_seq=1 ttl=64 time=0.035 ms
64 bytes from localhost (::1): icmp_seq=2 ttl=64 time=0.047 ms
64 bytes from localhost (::1): icmp_seq=3 ttl=64 time=0.049 ms
^C
--- localhost ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2004ms
rtt min/avg/max/mdev = 0.035/0.043/0.049/0.006 ms
zabbix@f501d68535a1:~$ fping localhost
localhost is unreachable
zabbix@f501d68535a1:~$

I am sure this is a simple config error on my part, but I can't seem to find it. I have looked at the fping location in the zabbix_server config files. The only mention I can find is in zabbix_server_location.config Which i appear unable to edit or modify as there appears to be no editor in the docker container at all (vi, vim nano all appear to not be installed)

### Option: FpingLocation
# Location of fping.
# Make sure that fping binary has root ownership and SUID flag set.
#
# Mandatory: no
# Default:
# FpingLocation=/usr/sbin/fping

FpingLocation=${ZBX_FPINGLOCATION}

### Option: Fping6Location
# Location of fping6.
# Make sure that fping6 binary has root ownership and SUID flag set.
# Make empty if your fping utility is capable to process IPv6 addresses.
#
# Mandatory: no
# Default:
# Fping6Location=/usr/sbin/fping6

Fping6Location=

Hope this is a quick fix and something i am just missing in the zabbix config somewhere. Thanks

[Llanelwy]

I realised I did not include my version info
TrueNAS SCALE Version
25.10.7 - Goldeye


App version
Name:
zabbix
App Version:
7.4.15-ubuntu
Version:
1.0.42
Source:
apps.truenas.com/catalog/zabbix_community, github.com/zabbix/zabbix-docker

Edit more info:

While troubleshooting, I have found that if I right-click on a host and use the ping script, that also works ok. However, none of the templates that use ICMP ping seems to work.

[MisterGlass]

I'm new to Zabbix and have the same problem. ICMP Ping template doesn't work.
In a terminal on the Zabbix server I can ping the hosts. And on the Zabbix website running the scripts Ping and Traceroute on the host work just fine.
Am i doing something wrong?



Running Zabbix 7.4.15 docker app on Truenas 25.10.7

[Llanelwy]

Sounds like we are in the same boat.

I think it that this has to be a bug in this version as i am getting the same thing. From the shell, can you reach anything using the command fping?
From what i have read, the system uses that, not the normal Ping command.

[MisterGlass]

You are right, fping doesn't work and returns a unreachable. When I do a traceroute it is reachable. This doesnt give me a lot of confidence in Zabbix, if a simple icmp test can get broken in an update.

$ fping 1.1.1.1
1.1.1.1 is unreachable
$ traceroute 1.1.1.1
7 141.101.65.185 (141.101.65.185) 6.734 ms 141.101.65.184 (141.101.65.184) 6.398 ms 185.147.12.101 (185.147.12.101) 11.992 ms
8 141.101.65.227 (141.101.65.227) 7.306 ms 141.101.65.241 (141.101.65.241) 22.789 ms 141.101.65.185 (141.101.65.185) 5.280 ms
9 one.one.one.one (1.1.1.1) 7.568 ms 6.585 ms 141.101.65.239 (141.101.65.239) 5.934 ms

Even a ping to localhost is unreachable
$ fping 127.0.0.1
127.0.0.1 is unreachable

Ping works ok:
$ ping 1.1.1.1
PING 1.1.1.1 (1.1.1.1) 56(84) bytes of data.
64 bytes from 1.1.1.1: icmp_seq=1 ttl=54 time=7.35 ms
64 bytes from 1.1.1.1: icmp_seq=2 ttl=54 time=7.19 ms

The execution rights are set for all users
$ ls -la /usr/bin/fping
-rwxr-xr-x+ 1 root root 48080 Nov 26 2025 /usr/bin/fping

Now what?!