FortiGate SNMP problem

[Liza1]

We are experiencing the following issue with our FortiGate 30E. We have a network with the address 10.48.5.1/24, which is configured on the firewall interface. Unfortunately, after adding SNMP, the sensors are not working properly. For example, the ping works without interruptions, but other sensors, such as traffic on different interfaces or memory and CPU usage, sometimes lose connection and sometimes do not.

A similar issue does not occur with a Cisco switch that is added to PRTG with the IP address 10.48.5.22—it provides all information instantly without problems.

Could you advise what might be causing this issue? How can I resolve it? The monitoring system often encounters problems, with some sensors turning off and on randomly, leading to a large number of alerts.

The PRTG machine has access via a VPN tunnel, and the VPN tunnel itself is working properly.
FortiGate  #SNMP #Monitoring #Configuration #30E

[Dhruvin_patel]

Greetings!

It seems like you are facing SNMP monitoring issues with your FortiGate 30E, where some sensors intermittently lose connection or do not work properly.

- Ensure SNMP access is enabled on the interface where the request is received.

- Verify if the IP of the PRTG server is added to the trusted hosts on the FortiGate.

- Confirm that the SNMP agent is enabled and properly configured on the FortiGate.

- Check for any special characters in the community name used for SNMP monitoring.

- Confirm that the VPN tunnel is stable and not causing intermittent connectivity issues.

- Check for any community mismatch errors in the FortiGate logs.

- Ensure that the community name on the FortiGate matches the one configured on PRTG for SNMP monitoring.

- Use debugging tools like SNMP debug and packet captures to identify any specific errors or issues when SNMP queries fail.

https://community.fortinet.com/t5/FortiGate/Troubleshooting-Tip-General-troubleshooting-guide-for-SN... 

https://community.fortinet.com/t5/FortiGate/Technical-Tip-SNMP-Server-unable-to-pull-information-fro... 

Regards!