---
name: "CURLOPT_FTPSSLAUTH"
section: "3"
platform: "linux"
package: "curl"
version: "8.23.0-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux", "macos"]
url: "https://new.carta.tech/CURLOPT_FTPSSLAUTH"
---

# CURLOPT\_FTPSSLAUTH(3)

order in which to attempt TLS vs SSL

## 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 issues "AUTH TLS" or "AUTH SSL" when FTP over SSL is activated. This is only interesting if *[CURLOPT\_USE\_SSL(3)](/CURLOPT_USE_SSL/3.md)* 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 result;
    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);
    result = 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)](/curl_easy_setopt/3.md)*.

## AVAILABILITY

Added in curl 7.12.2

## RETURN VALUE

*[curl\_easy\_setopt(3)](/curl_easy_setopt/3.md)* returns a CURLcode indicating success or error.

CURLE\_OK (0) means everything was OK, non-zero means an error occurred, see *[libcurl-errors(3)](/libcurl-errors/3.md)*.

## SEE ALSO

[**CURLOPT\_FTP\_SSL\_CCC**(3)](/CURLOPT_FTP_SSL_CCC/3.md), [**CURLOPT\_USE\_SSL**(3)](/CURLOPT_USE_SSL/3.md)