---
c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
SPDX-License-Identifier: curl
Title: CURLOPT_FTPSSLAUTH
Section: 3
Source: libcurl
Protocol:
  - FTP
See-also:
  - CURLOPT_FTP_SSL_CCC (3)
  - CURLOPT_USE_SSL (3)
Added-in: 7.12.2
---

# NAME

CURLOPT_FTPSSLAUTH - order in which to attempt TLS vs SSL

# SYNOPSIS

~~~c
#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 issues
"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%

# EXAMPLE

~~~c
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, CURLFTPAUTH_SSL);
    res = curl_easy_perform(curl);
    curl_easy_cleanup(curl);
  }
}
~~~

# HISTORY

**CURLFTPAUTH_*** enums became `long` types in 8.16.0, prior to this version
a `long` cast was necessary when passed to curl_easy_setopt(3).

# %AVAILABILITY%

# 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).
