I run a WordPress site that got a good volume of comments (~1,4k monthly). Last July, I started using Cloudflare in a new hosting, and so an annoying issue appeared: for some readers, commenting became impossible.
When they comment, no error message is shown, but their comments just vanish. They aren’t caught by Akismet or pending approval, so I started digging with some help from my hosting support to find what was wrong.
My hosting support was suspicious of Cloudflare, and after trying several settings adjustment, earlier today I paused Cloudflare completely on that domain. This “solved” the issue, but I can’t afford having no CDN, so I need to find what to tune on Cloudflare to avoid those false negatives on filtering/blocking/whatever it’s doing to those legitimate comments.
Any idea about what could be?
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Check DevTools. Enable WP_Debug.
Look in the cloudflare firewall, make a comment and look up what happens to your IP. You might be hitting a WAF rule. Can also open a support ticket, post on the CF forums.