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This error should never be returned by a properly functioning TFTP server.
Problem with reading the SSL CA cert (path? access rights?)
The resource referenced in the URL does not exist.
An unspecified error occurred during the SSH session.
Failed to shut down the SSL connection.
Socket is not ready for send/recv wait till it's ready and try again. This return code is only returned from curl_easy_recv and curl_easy_send (Added in 7.18.2)
Failed to load CRL file (Added in 7.19.0)
Issuer check failed (Added in 7.19.0)
The FTP server does not understand the PRET command at all or does not support the given argument. Be careful when using CURLOPT_CUSTOMREQUEST, a custom LIST command is sent with the PRET command before PASV as well. (Added in 7.20.0)
Mismatch of RTSP CSeq numbers.
Mismatch of RTSP Session Identifiers.
Unable to parse FTP file list (during FTP wildcard downloading).
Chunk callback reported error.
(For internal use only, is never returned by libcurl) No connection available, the session is queued. (added in 7.30.0)
Failed to match the pinned key specified with CURLOPT_PINNEDPUBLICKEY.
Status returned failure when asked with CURLOPT_SSL_VERIFYSTATUS.
Stream error in the HTTP/2 framing layer.
An API function was called from inside a callback.
An authentication function returned an error.
A problem was detected in the HTTP/3 layer. This is somewhat generic and can be one out of several problems, see the error buffer for details.