SNMP Timeout only in SNMPv2

[NikoMitK]

Hey guys,

Last week we migrated some of our servers and devices to our main location with another Subnet.
Before we had one Network A(207) with the Zabbix Server and one Network B(105) with a Zabbix Proxy monitoring the hosts.
Now almost the entire Network B is part of Network A but still has the old 105-IP-adresses. Every Host that is in that NetworkAB is working correctly.

The Proxy now is in a Network C(104), where just a few Hosts are left, but it has a new IP-adress now.

I changed the IP of the proxy in frontend and now the frontend shows me a red SNMP Icon with 'Timeout while connecting to "<HOST_OF_NETWORKC:161>"'

So far, so good, now to the strange part (for me)
When I try snmpwalk (SNMPv2) from the Proxy to the Host I get the same error, but when I try a snmpwalk (SNMPv1) it is working correctly.
The same happens, when i directly try snmpwalk from Zabbix Server to the Host.


I would appreciate any suggestions, what could cause this error.

EDIT: The same is happenning when i try snmpwalk on localhost

[kloczek]

If you can please repeat test with SNMPv3.

[NikoMitK]

The error occurs with SNMPv3, too.

[kloczek]

The error occurs with SNMPv3, too.

So try to check CPU utilization on your SNMP device during such queries. You can find necessary OIDs in HOST-RESOURCES-MIB if your device supports this MIB, Sometimes (Brocade, BIG5 and other) such OIDs are exposed over vendor specific MIB.
You should be able as well check CPU utilisation remotely over CLI if such access is provided.

[NikoMitK]

So try to check CPU utilization on your SNMP device during such queries.

I would try that, but the only device in this network at the moment is an UPS, that don't support CPU monitoring.