Hi All. We've just had a CF captcha image disappear on a single client site, and we're banging our heads a bit trying to figure out why. The captcha url that is breaking is like this: The strange thing is that the captcha works fine on other identical pages on the same code base and server. I have seen something like this before where a 3rd party dns like Cloudflare is involved (which I still don't know how to fix). But, in this case no 3rd party DNS / security providers are involved that I know of.

Is it giving a 404 error or what when directly putting the url into the browser?

yes, a 404

Did you confirm that the file is in fact at that exact location on the server?

I don't know how to find that exact file on the server. As far as I know, CF generates these files automatically as part of the captcha feature built into CF

Permission issue in that folder on that subdomain?

@Mark Takata (Adobe) We had an issue in web.config. All set now! Thanks! We are having a similar issue on one client site where they use Cloudflare for their DNS. If you have come across any situations where cloudflare breaks captcha, that would be great to know.