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Fortinet FortiAuthenticator SNMP


FortiAuthenticator is the gatekeeper of authorization into the Fortinet secured enterprise network identifying users, querying access permissions from third party systems, and communicating this information to FortiGate devices for use in Identity-Based Policies.

Th related Centreon Monitoring Connector uses the SNMP protocol to check and gather information and metrics about the FortiAuthenticator devices.

Monitoring Connector assets

Monitored objects

  • FortiAuthenticator appliances and virtual machines

Collected metrics

Metric nameDescriptionUnit of authentication events per second
authenticator.authentication.failures.persecondNumber of authentication failures per second
authenticator.groups.countTotal number of user groups
authenticator.groups.percentagePercentage of user groups usage%
authenticator.radius.nas.countTotal number of Radius NAS
authenticator.radius.nas.percentagePercentage of Radius NAS usage%
authenticator.users.countTotal number of local users
authenticator.users.percentagePercentage of users usage%


Device Configuration

On the FortiAuthenticator device, enable and configure the SNMP agent:

  • Connect to the HDX Admin Web UI
  • Go to System > Administration > SNMP
  • Configure the SNMP settings to be used by Centreon

Network flows

The Centreon Poller must be able to reach the UDP/161 SNMP port of the FortiAuthenticator device.


  1. Install the Centreon package on every Centreon Poller expected to monitor FortiAuthenticator devices:
yum install centreon-plugin-Network-Fortinet-Fortiauthenticator-Snmp
  1. On the Centreon Web interface, install the Fortinet Fortiauthenticator SNMP Monitoring Connector through Configuration > Monitoring Connector Manager page.

Host configuration

  • Add a new Host and fill the IP Address/FQDN, SNMP Version and SNMP Community fields according to the device's configuration
  • Apply the Net-Fortinet-Fortiauthenticator-SNMP-custom Host Template

When using SNMP v3, use the SNMPEXTRAOPTIONS Macro to add specific authentication parameters More information in the Troubleshooting SNMP section.

SNMPEXTRAOPTIONSConfigure your own SNMPv3 credentials combo


How to test the Plugin and what are the main options for?

Once the plugin installed, log into your Centreon Poller CLI using the centreon-engine user account and test the Plugin by running the following command:

/usr/lib/centreon/plugins/ \
--plugin=network::fortinet::fortiauthenticator::snmp::plugin \
--mode=authenticator \
--hostname= \
--snmp-version='2c' \
--snmp-community='mysnmpcommunity' \
--warning-users-usage-prct='80' \
--critical-users-usage-prct='90' \
--warning-authentication-failures='50' \
--critical-authentication-failures='100' \

Expected command output is shown below:

OK: Authenticator statistics are ok | 'authenticator.users.count'=9;;;0;10100 'authenticator.users.percentage'=0.09%;;;0;100
'authenticator.groups.count'=1;;;0;1010 'authenticator.groups.percentage'=0.10%;;;0;100 'authenticator.radius.nas.count'=3;;;0;10100
'authenticator.radius.nas.percentage'=0.03%;;;0;100 ''=0/s;;;0;
checking authenticator
users total: 10100 used: 9 (0.09%) free: 10091 (99.91%)
groups total: 1010 used: 1 (0.10%) free: 1009 (99.90%)
radius nas total: 10100 used: 3 (0.03%) free: 10097 (99.97%)
authentication events: 0/s, failures: 0/s

The command above monitors the authentication statistics of a FortiAuthenticator device (--plugin=network::fortinet::fortiauthenticator::snmp::plugin --mode=authenticator) identified by the IP address (--hostname= As the Plugin is using the SNMP protocol to request the device, the related community and version are specified (--snmp-version='2c' --snmp-community='mysnmpcommunity').

This command would trigger a WARNING alarm if the current user sessions rate raises over 80% of the device capabilities (--warning-users-usage-prct='80') and a CRITICAL alarm over 90% (--critical-users-usage-prct='90'). In a similar way, alarms would also be triggered if the per second authentication failure rate raises over the defined thresholds (--warning-authentication-failures='50' --critical-authentication-failures='100').

All the options as well as all the available thresholds can be displayed by adding the --help parameter to the command:

/usr/lib/centreon/plugins/ --plugin=network::fortinet::fortiauthenticator::snmp::plugin --mode=authenticator --help

UNKNOWN: SNMP GET Request : Timeout

If you get this message, you're probably facing one of theses issues:

  • The SNMP agent of the device isn't started or is misconfigured
  • An external device is blocking the request (firewall, ...)

UNKNOWN: SNMP GET Request : Cant get a single value.

This error message often refers to the following issues:

  • the FortiAuthenticator device doesn't support the MIB used by the Plugin
  • the targeted SNMP OID cannot be fetched because of insufficient privileges on the device