Zabbix server and proxy problem

[kinetixbg]

Hello,
I have problem based on this case: https://www.zabbix.com/forum/zabbix-...ng?view=thread


Zabbix server can't see hosts behind proxy.
Server> telnet proxy 10051 - OK
proxy> telnet server 10051 - OK

remote_host1 is set to monitored by proxy.
Zabbix_Server ping remote_host1 trough interface and result is getting back from proxy - because remote proxy time is around 10-15 ms, and on these result here - is bellow 5 ms, so, I guess that pinging is trough proxy and result is getting back by proxy to server.

PING 192.168.1.116 (192.168.1.116) 56(84) bytes of data.
64 bytes from 192.168.1.116: icmp_seq=1 ttl=254 time=0.941 ms
64 bytes from 192.168.1.116: icmp_seq=2 ttl=254 time=1.02 ms
64 bytes from 192.168.1.116: icmp_seq=3 ttl=254 time=3.44 ms

--- 192.168.1.116 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2002ms
rtt min/avg/max/mdev = 0.941/1.802/3.444/1.161 ms

But, on Zabbix server dashboard and Host page - seeing that host is unavailable by ping.
Zabbix Server and Proxy versions is 6.4.4 - worked by years, but I started update OS from Suse Leap 15.4 to 15.6 and on this step - I got this problem and can't deal with it already second week.
Could you advice me how to solve this case? - proxy was made with clean install, but zabbix server is not touched still.

[kinetixbg]

To all users, I hope this help.

Check fping SUID bit on remote proxy instance. it should be executable, otherwise you will get Unavailable by ping, script part with ping will work, you could ping host, and so on ... hours, days time - and this is not writing as error in zabbix_proxy, server, log files.

Explanation: my first step was to update OS on proxy, and in this step I guess, fping was replaced/reinstalled by update process.