SNMP Error : cannot retrieve OID - time out

[Vino92130]

Hello everyone
I hope you are all well.
I am new to Zabbix, but I have completed a Zabbix training course. I am the only one in my team studying Zabbix. I am teaching myself.


Today, I am having a problem with SNMP.

I use Hyper-V to virtualize my servers/desktops.
I have successfully installed the Zabbix server v7.4.1 192.168.1.20 and a desktop VM 192.168.1.23.
Both are running Ubuntu 24.04.3.
I have installed and configured SNMP monitoring on the VM:
- sudo apt install snmp -y
- sudo apt install snmp snmpd libsnmp-dev
- sudo systemctl stop snmpd
- sudo net-snmp-config --create-snmpv3-user -ro -a SHA-512 -A myauthphrase -x AES -X myprivphrase authPrivUser
- sudo systemctl start snmpd
- sudo systemctl status snmpd
- sudo nano /etc/snmp/snmpd.conf
>> Comment the line: #agentaddress 127.0.0.1,[::1]
>> Add: agentaddress 192.168.1.23



Other importants lines active by default...




Command to test the correct SNMP configuration on the VM:
snmpget -v 3 -u authPrivUser -l authpriv -a SHA-512 -A myauthphrase -x AES -X myprivphrase 192.168.1.23 1.3.6.1.2.1.1.1.0


I installed SNMP on the Zabbix server :
- sudo apt install snmp -y

Command to test the correct SNMP configuration on the Zabbix server:
snmpget -v 3 -u authPrivUser -l authpriv -a SHA-512 -A myauthphrase -x AES -X myprivphrase 192.168.1.23 1.3.6.1.2.1.1.1.0

I created a host on the Zabbix server and set its configuration.


I am receiving an error message: “Probe successful, cannot retrieve OID: ‘.1.3.6.1.4.1.2021.4.3.0’ from [[192.168.1.23]:161]:time out.”
The SNMP icon is red.

What can I do to make the SNMP icon turn green in the Zabbix server? I can't find the error in my configuration.
Thank you in advance for your help.

[Grant Doolittle]

I'm getting the exact same "Probe successful, cannot retrieve OID" error however this is on a Cisco ASR-1002-X router. It seems like it can connect as the icon will sometimes be green for a bit if I make a significant change to the SNMP user, but then after that it will go back to red with that error.
I'm still looking for a solution to this myself.

[BP_Vital]

Just a quick guess - you try to snmpget 1.3.6.1.2.1.1.1.0 from terminal and Zabbix can't retrieve 1.3.6.1.4.1.2021.4.3.0.
Could you try to snmpget 1.3.6.1.4.1.2021.4.3.0 from terminal?

[Grant Doolittle]

Because of how things are at the moment I don't have access to the terminal to test that.
I was able to resolve the issue by using only auth instead of authpriv. For some reason Cisco SNMP and Zabbix 7.0.21 seem to have an issue communicating if I use Priv on V3.