I've a problem regarding Stripe Webhooks (and some other tools). Somehow we receive HTTP 525 errors since a few days. So there seems to be a SSL handshake error. The strange thing is, that only Stripe and a few crawl bots are affected. The website works as expected when I visit it with various browsers.
Here is some analytics data from Cloudflare:
All of them seem to have an empty X-Requested-With
header.
Any idea what I can do?
We use Cloudflare and Cloudflare Loadbalancers. All traffic is proxied by Cloudflare. We have 2 origin servers. I've already created and installed new certificates, added/changed ciphers, added/updated different TLS versions, changed SSL mode within Cloudflare from Off to Full (strict) and all options between.