421421 Misdirected Request
The request was directed at a server that is not able to produce a response for the combination of scheme and authority in the request URI.
What causes this error
The server received a request intended for a different server. This commonly happens with HTTP/2 connection coalescing where a single TLS connection serves multiple domains, but one domain cannot handle the request.
How to fix it
Retry the request, which will usually force a new connection to the correct server. If persistent, check your DNS and TLS certificate configuration for the target domain.
Related Error Codes
520520 Web Server Returned an Unknown Error
Cloudflare received an unexpected or empty response from the origin server.
304304 Not Modified
The resource has not been modified since the last request, so the client can use its cached copy.
423423 Locked
The resource being accessed is locked and cannot be modified (WebDAV).
510510 Not Extended
The server requires further extensions to the request in order to fulfill it.
401401 Unauthorized
The request requires user authentication. The client must provide valid credentials to access the resource.
524524 A Timeout Occurred
Cloudflare established a TCP connection but the origin server did not respond with an HTTP response in time.