ftp · ftp/421
421
Service Not Available
The service is not available and the control connection is being closed. Typically sent when the server is shutting down or overloaded.
Also defined in
- http Misdirected Request The request was directed at a server that is not able to produce a response for the requested URI.
- react Suspense Boundary Update Before Hydration This Suspense boundary received an update before it finished hydrating. This caused the boundary to switch to client rendering. To fix this, wrap the initial state update that triggers the Suspense boundary in startTransition.
- sip Extension Required The server requires a specific extension that is not listed in a Supported header field in the request. The response includes a Require header indicating the needed extension.
- smtp Service not available The server is temporarily unavailable and is closing the connection. The client should retry later.