Hello !

I'm relatively new to SNMP and currently trying to add somes snmp sensor from my fortigate device to prtg. I'd like to be able to monitor VPN state.

I followed this tutorial :

I have setup snmp v2 on one firewall. I have setup a device on prtg with the right ip and snmp info and some basic sensor like ping are working fine. I downloaded MIB file from my fortigate, converted them with paessler tool and put them in my prtg install. But when I try to add that sensor via "SNMP bibliothek" the sensor goes into "config", which usually take a matter of seconds, but there it juste get stuck, the progress bar looping again and again. I have let it run one full night for nothing.

I try to access my device with paessler SNMP tester and that worked fine (did a simple "scan interfaces").

Any idea of what I could do to understand what is happening ?

Thank you in advance

Article Comments

Hello there,
thank you for your KB-Post.

This a "known issue" with Fortigate's MIB, which usually fails to import because it contains too much information. Please refer to the following:

The solution is described in the link above, it consists of removing part of the MIB using "Partial Selection" in the MIB Importer, before saving the oidlib file.

On a side note, if you're looking to monitor data from a Table and you know the OID, you could give our Table Sensor a try, it allows for multi-channel sensors:

I've lookup-up the FORTINET-FORTIGATE-MIB and the Table's OID appears to be:

fgVpnTunTable1.3.6.1.4.1.12356.101.12.2.2

The MIB is visible in HTML form on the following 3rd party website:

Best Regards,
Luciano Lingnau [Paessler Support]


Feb, 2017 - Permalink

Thank you ! I just excluded "fg ip sess" and it works like a charm.


Feb, 2017 - Permalink