CURLOPT_FTPSSLAUTH(3) Library Functions Manual CURLOPT_FTPSSLAUTH(3)
NAME
CURLOPT_FTPSSLAUTH - order in which to attempt TLS vs SSL
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_FTPSSLAUTH, long order);
DESCRIPTION
Pass a long using one of the values from below, to alter how libcurl is-
sues "AUTH TLS" or "AUTH SSL" when FTP over SSL is activated. This is
only interesting if CURLOPT_USE_SSL(3) is also set.
Possible order values:
CURLFTPAUTH_DEFAULT
Allow libcurl to decide.
CURLFTPAUTH_SSL
Try "AUTH SSL" first, and only if that fails try "AUTH TLS".
CURLFTPAUTH_TLS
Try "AUTH TLS" first, and only if that fails try "AUTH SSL".
DEFAULT
CURLFTPAUTH_DEFAULT
PROTOCOLS
This functionality affects ftp only
EXAMPLE
int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
CURLcode res;
curl_easy_setopt(curl, CURLOPT_URL, "ftp://example.com/file.txt");
curl_easy_setopt(curl, CURLOPT_USE_SSL, CURLUSESSL_TRY);
/* funny server, ask for SSL before TLS */
curl_easy_setopt(curl, CURLOPT_FTPSSLAUTH, (long)CURLFTPAUTH_SSL);
res = curl_easy_perform(curl);
curl_easy_cleanup(curl);
}
}
AVAILABILITY
Added in curl 7.12.2
RETURN VALUE
curl_easy_setopt(3) returns a CURLcode indicating success or error.
CURLE_OK (0) means everything was OK, non-zero means an error occurred,
see libcurl-errors(3).
SEE ALSO
CURLOPT_FTP_SSL_CCC(3), CURLOPT_USE_SSL(3)
libcurl 2026-07-12 CURLOPT_FTPSSLAUTH(3)
Generated by dwww version 1.16 on Sat Oct 3 05:46:36 CEST 2026.