WordPress > Add Plugins : Failed to connect to FTP Server
I got this error: Failed to connect to FTP Server
I had to change setting on my server.
I opened console panel.
$ : cd /www/my wp site
in the folder:
$: sudo chown -R www-data:www-data *
source: http://diegobenna.blogspot.hu/2013/07/wordpress-solution-failed-to-connect-to.html