I use SNMP v3 from our 7.4.7 Zabbix server to poll clients' routers. We have noticed that when a device becomes unreachable, Zabbix alerts as expected. However, after a period of time Zabbix stops monitoring that device and so when the device becomes reachable again Zabbix fails to reset the alert until we restart the server (systemctl restart zabbix-server).
The fault is mostly but not entirely repeatable.
Trying zabbix_server -R log_level_increase="snmp poller" adds no value. Running zabbix_server -R snmp_cache_reload does not resolve the fault. The last lines from the zabbix_server.log are as follows,
17731:20260312:171747.916 SNMP agent item "net.if.status[ifOperStatus.24]" on host "xx_remote_host_xx" failed: first network error, wait for 15 seconds
17737:20260312:171806.705 SNMP agent item "net.if.status[ifOperStatus.24]" on host "xx_remote_host_xx" failed: another network error, wait for 15 seconds
17737:20260312:171857.996 temporarily disabling SNMP agent checks on host "xx_remote_host_xx": interface unavailable
Only once I restart the Zabbix server do I get the expected message in the log and SNMP polling restarts,
1425192:20260313:115347.933 enabling SNMP agent checks on host "xx_remote_host_xx": interface became available
Any suggestions please?
The fault is mostly but not entirely repeatable.
Trying zabbix_server -R log_level_increase="snmp poller" adds no value. Running zabbix_server -R snmp_cache_reload does not resolve the fault. The last lines from the zabbix_server.log are as follows,
17731:20260312:171747.916 SNMP agent item "net.if.status[ifOperStatus.24]" on host "xx_remote_host_xx" failed: first network error, wait for 15 seconds
17737:20260312:171806.705 SNMP agent item "net.if.status[ifOperStatus.24]" on host "xx_remote_host_xx" failed: another network error, wait for 15 seconds
17737:20260312:171857.996 temporarily disabling SNMP agent checks on host "xx_remote_host_xx": interface unavailable
Only once I restart the Zabbix server do I get the expected message in the log and SNMP polling restarts,
1425192:20260313:115347.933 enabling SNMP agent checks on host "xx_remote_host_xx": interface became available
Any suggestions please?