Session & captcha in Windows shared hosting

Session Problem : 
I unable to save my session "ci_sessions" folder. 
I want to all session save "ci_sessions" folder. 
We are using windows hosting database using MS SQL. 
Our local server working fine when i was upload live server i unable to change session path my

config.php code here

PHP Code:

$config['sess_driver'] = 'files';
$config['sess_cookie_name'] = 'ci_session';
$config['sess_expiration'] = 43200;
$config['sess_save_path'] = NULL;
$config['sess_match_ip'] = FALSE;
$config['sess_time_to_update'] = 300;
$config['sess_regenerate_destroy'] = FALSE;
$config['log_threshold'] = 4; 


.user.ini code

PHP Code:

[PHP]
extension=php_gd2
open_basedir=none
error_reporting=22519
display_errors=on
error_log="D:\INETPUB\VHOSTS\somthing.com\logs\php_errors\demo.somthing.com\php_error.log"
session.save_path="ci_sessions" 


CodeIgniter Version : [b]3.1.11[/b]

Live Server : [b]Windows shared hosting[/b]

@nmdinesh,

What error messages are you seeing? Have you determined that the permissions of the session path is correct?