When the request comes from 126.96.36.199:443, it is successful.
I have also whitelisted the IPs listed here IP Ranges
Any ideas what is causing this issue or how to fix it?
Do those certain requests from the specific remote address always return a 500? And are other requests from the same specific remote address always getting through?
A 500 is something at your provider’s end that’s not letting the request through. Sometimes it’s a firewall upstream from your account.
Since it’s reproducible, open a Support Ticket. I’m sure they’d love to figure out this inconsistency: Login & go to https://dash.cloudflare.com/?account=support
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