502 errors only through Ashburn, VA (IAD)

Quite often, the server is blocking a Cloudflare IP address. It could just be that there’s more traffic going through IAD, triggering a firewall response at your end.

Cloudflare doesn’t monitor 502 errors because there’s nothing Cloudflare can do about them.

https://support.cloudflare.com/hc/en-us/articles/218378978-What-should-I-do-after-seeing-a-502-or-504-gateway-error-on-my-site-

Or is the Cloudflare edge showing this 502 screen?