Our payment service provider sends callbacks to WooCommerce from IP range 213.207
On this ways I added the whitelist for this range: Screenshot by Lightshot
The callback still is failed and our payment provider gets a 503 after proxy response.
Even if we only use Cloudflare DNS by turning the clouds grey.
But when we use our own nameservers everything works fine.
Is this the right way for whitelisting?
How can’t it work even if we only use Cloudflare for DNS?
Are you still encountering this issue? Changing the nameservers moves the site away from cloudflare. The 503 is a rate limit error, is there any accompanying text with the error code?