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Top Forums Shell Programming and Scripting How to connect to FTP server which requires SSL authentication? Post 302569355 by amitshete on Monday 31st of October 2011 03:59:55 AM
Old 10-31-2011
How to connect to FTP server which requires SSL authentication?

Hello,

I tried searching through lot of threads for a solution but couldn't fetch the exact solution, so I am creating a new thread.

I am trying to connect to a FTP server

1) using a simple FTP command, it gives the error :
Code:
534 Policy requires SSL.
Login failed.

2) using SFTP command on port number 21
Code:
ssh_exchange_identification: read: Connection reset by peer
Couldn't read packet: Connection reset by peer

3) using curl command, it throws following error
Code:
curl: (67) Access denied: 534

I am stuck at this point and could not think of any solution. Let me know if I am missing out on anything here.

Thanks in advance & apologies if a similar thread already exist.

Regards,
Amit

Last edited by Scott; 11-09-2011 at 02:35 PM.. Reason: Code tags...
 

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CURLOPT_USE_SSL(3)					     curl_easy_setopt options						CURLOPT_USE_SSL(3)

NAME
CURLOPT_USE_SSL - request using SSL / TLS for the transfer SYNOPSIS
#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_USE_SSL, long level); DESCRIPTION
Pass a long using one of the values from below, to make libcurl use your desired level of SSL for the transfer. These are all protocols that start out plain text and get "upgraded" to SSL using the STARTTLS command. This is for enabling SSL/TLS when you use FTP, SMTP, POP3, IMAP etc. CURLUSESSL_NONE Don't attempt to use SSL. CURLUSESSL_TRY Try using SSL, proceed as normal otherwise. CURLUSESSL_CONTROL Require SSL for the control connection or fail with CURLE_USE_SSL_FAILED. CURLUSESSL_ALL Require SSL for all communication or fail with CURLE_USE_SSL_FAILED. DEFAULT
CURLUSESSL_NONE PROTOCOLS
FTP, SMTP, POP3, IMAP EXAMPLE
CURL *curl = curl_easy_init(); if(curl) { curl_easy_setopt(curl, CURLOPT_URL, "ftp://example.com/dir/file.ext"); /* require use of SSL for this, or fail */ curl_easy_setopt(curl, CURLOPT_USE_SSL, CURLUSESSL_ALL); /* Perform the request */ curl_easy_perform(curl); } AVAILABILITY
Added in 7.11.0. This option was known as CURLOPT_FTP_SSL up to 7.16.4, and the constants were known as CURLFTPSSL_* RETURN VALUE
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not. SEE ALSO
CURLOPT_SSLVERSION(3), CURLOPT_SSL_OPTIONS(3), libcurl 7.54.0 February 03, 2016 CURLOPT_USE_SSL(3)
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