The checker
Check a URL
Type a URL. One request is made to it — at most two redirects are followed. Nothing is crawled, and nothing is saved.
Platform limit: this checker runs on Cloudflare's network and cannot open connections to hosts that are themselves behind Cloudflare — example.com, cloudflare.com and many others. Those hosts report as "could not connect" even when the site is up. That is a limit of the checker, not a finding about your site.
No check yet. Type a URL above.