CURLcode curl_easy_setopt(CURL *handle, CURLOPT_FTPSSLAUTH, long order);
DESCRIPTIONPass 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:
- Allow libcurl to decide.
- Try "AUTH SSL" first, and only if that fails try "AUTH TLS".
- Try "AUTH TLS" first, and only if that fails try "AUTH SSL".