Requirements

OpenNMS

The OpenNMS ServiceNow Plugin requires OpenNMS Horizon 31+ or OpenNMS Meridian 2023+.

ServiceNow

A ServiceNow instance with:

  • An OAuth2 application registry configured (client ID + client secret)

  • A token endpoint accessible from the OpenNMS server

  • REST API endpoints for alert and asset creation/update

Network

The OpenNMS server must be able to reach the ServiceNow REST API over HTTPS. If the ServiceNow instance uses a self-signed or untrusted certificate, SSL validation can be disabled per-connection (not recommended in production).