Sometimes, when sharing an article on Facebook (either via a share button of by just putting the URL in a post box), Facebook hits the Cloudflare Challenge page. This causes the preview/post card to be the “Attention Required!” text, etc. (See below)
Now, I just can’t figure out why FB would ever hit that page. We have the normal WAF settings in place, as well as Rate Limiting on the (wordpress) login page.
Does anyone have an idea what could cause this to happen and above all: how I can prevent this?