---
id: "9e8be974-ae60-41f6-9731-8c693243e581"
name: "Security Event Attribution"
micro_summary: "Cloudflare event filtering and fields that attributed the ChatGPT DCR 403 to Bot Fight Mode."
status: "resolved"
see_also: []
scope: "Use Cloudflare Security → Analytics → Events and the authenticated ActivityLogQuery to attribute SiftText MCP request actions, rules, rays, clients, and timing."
---
## Verified event-attribution recipe — 2026-09-04

Cloudflare's authenticated Security → Analytics → Events page exposed sampled logs on the Free plan. The page's `ActivityLogQuery` uses `firewallEventsAdaptive`; a scoped query filtered by datetime and `clientRequestPath_like` can return the action, source, rule ID, ray name, method, user-agent, client IP, and metadata without printing secrets.

The matching DCR event was:

- Time: `2026-09-04T07:33:12Z`
- Request: `POST /oauth/register` on `app.sifttext.com`
- Client: Azure ASN 8075
- User-agent: `Python/3.13 aiohttp/3.13.5`
- Action: `managed_challenge`
- Rule/source: `bot_fight_mode` / `botFight`
- Ray: `a35b4e02feea2b6f`

Safe GET, HEAD, and OPTIONS probes did not reproduce the 403. The event established that Cloudflare challenged ChatGPT's server-side DCR request before the SiftText handler.