Timeout error 524 with subdomains

i have domain example.com as “A” record points to server ip address in Cloudflare

and sub.example.com as unproxied ( grey cloud) “CName” record

when i run long-running process , i get 524 Error timeout after about 100 seconds

Why is this happening ?

This happens because Cloudflare only waits 100 seconds for your server to respond. (unless you’re on an Enterprise plan)

can i exclude this subdomain only from cloudflare ?

Not if it’s a CNAME for something set to :orange:. You would have to make it an “A” record that’s set to :grey:.

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