SNMPv3 - Cannot connect to "x.x.x.x:161": Not in time window.

[hemh]

Hi,

We are using zabbix 4.4 in our environment and since a few weeks, I encounter SNMPv3 problems.
Randomly, some of our 50 checkpoint firewall stop answering to SNMP, and I got this error messqage: Cannot connect to "x.x.x.x:161": Not in time window.
I tried to delete snmpv3 user and re create it on the checkpoint, sometimes it fix the problem, but sometimes not
I tried to poll inside interface instead of WAN interface, sometimes it fix the problem, but sometimes not...
Does anyone got the same problem?

[cyber]

Time synchronization is very important for snmpv3. Make sure your devices clocks are showing same time....