The error message shown in the current Tor Browser when a Tor Hidden Service can't be reached. The layout, icons and text all eerily reek of the way Cloudflare presents their errors... Text is: Onionsite Not Found The most likely cause is that the onionsite is offline. Contact the onionsite administrator. Details: 0xF0 — The requested onion service descriptor can't be found on the hashring and therefore the service is not reachable by the client.
https://cdn.fosstodon.org/media_attachments/files/108/976/434/776/946/581/original/e335634d22fb8c4d.png