How can I set up a sensor on my FortiGate WAN interface to show an alarm when my ISP is down, even if the interface is up?

There will be a target service which the users are working with. You can create sensors to simulate the working routine of your users, this might be a sensor scanning a particular website or service.

If this is not sufficient, you can write your own script to query values directly from the router via SSH.

  • Click here for a guide of Fortinet
  • The API documentation can be found under Setup | PRTG API | Custom Sensors


Disclaimer:
The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.