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Load Balancing
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Make sure that your firewall or web server does not block or rate limit your configured health checks or requests associated with Cloudflare IP addresses.

Each health check has the HTTP user-agent of "Mozilla/5.0 (compatible; Cloudflare-Traffic-Manager/1.0; +https://www.cloudflare.com/traffic-manager/; pool-id: $poolid)", where the $poolid is the first 16 characters of the associated pool.