I would like to prevent robots to index my web site. I created a robots.txt file with this content:
User-agent: *
Disallow: /
Now I must place this file in the root folder of my website. I try with my ftp software but it doesn’t work. The upload failed. As you can see on the picture below, I try at the very top level ( / ). Is it correct? Or do I have to upload the file in the /httpdocs folder?

Thanks.
UPDATE
Here is the content of the httpdocs folder

robots.txt should go where the root of your website is. It looks like you should put it in httpdocs from your screenshots.
To check…copy it there, and navigate to yoursite.com/robots.txt . If you get a 404, then it’s in the wrong place. If you see your robots.txt file, you’re good to go!