To protect the site from DDOS attacks, many use the Cloudflare service. When protection is enabled, the Cloudflare service filters requests to the resource, including using its own statistics and various heuristics. This may cause requests from some host-tracker agents to be blocked by the Cloudflare service. One of the solutions to this problem is to set up a whitelist in Clourflare, below is an instruction on how to do this:
1. Log into Cloudflare account
2. Select WAF
3. Add new rule
The host-tracker service uses a string containing http://www.host-tracker.com as the User Agent. However, you can set up an arbitrary string for the User Agent for http type checks, in which case you need to add it to the rule.
4. Configure rule