Unexpected, excessive requests from CloudFlare-Traffic-Manager to non-CloudFlare domain

My domain httpbingo.org — for which I have not configured any Cloudflare services — has been receiving a steady 20 req/sec from this user agent since March 11:

Mozilla/5.0 (compatible; Cloudflare-Traffic-Manager/1.0; +https://www.Cloudflare.com/traffic-manager/; pool-id: 18584fe061f46ce9)

Spot checking the client IP addresses, they all seem to be coming from Cloudflare’s network.

Because I have not configured Cloudflare in front of this app, I do not understand why Cloudflare-Traffic-Manager has been hammering it (relatively speaking) with traffic for the better part of a month. I’m hoping this is just a misconfiguration somewhere, and that the pool-id: 18584fe061f46ce9 metadata in the user agent will help figure out where.

This elevated request volume has started to cost me actual money, so I’d really like to put a stop to it if possible.

I’ve tried making the app respond with 403, 429, and 502 errors in the hopes that your system might back off, but those error responses seem to have no effect on request volume from that user agent.

I would really appreciate any help you can provide!

This suggests it’s Cloudflare’s load balancer monitoring, are you using any service that may be using Cloudflare themselves?

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No, as far as I’m aware, I’m not using any other service that might be using Cloudflare. This is an app hosted on https://fly.io, FWIW.

Checking logs, it looks like someone else has configured Pingdom to monitor my site (a mystery for another day), but I can’t imagine Pingdom would be using Cloudflare’s load balancers as part of checking the status.

I wonder if someone has also configured Cloudflare healthchecks to add to the number of requests.

Hi, I am a member of Cloudflare support team. I have opened a ticket for investigation on your behalf, and will update you via the ticket.

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