FWIW, I've only seen the issue you reported when resolving a Cloudflare hosted site through Cloudflare dns, with Firefox as the client. Refreshing multiple time

FWIW, I've only seen the issue you reported when resolving a Cloudflare hosted site through Cloudflare dns, with Firefox as the client. Refreshing multiple times seemed to work. I haven't had the time to investigate it when it occurred; anecdata. I have wondered if it's related to handing off from the CF balancer to the sites tls.