I can connect my vps ip with putty ,hostname is a.b.c.d , ftp user is root ,password is password . None of connection type (ftp or ftps) can add a new plugin .
Failed to connect to FTP Server
Connection Information
To perform the requested action, WordPress needs to access your web server. Please enter your FTP credentials to proceed. If you do not remember your credentials, you should contact your web host.
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Wordpress will prompt you for FTP credentials if it does not have permission to write the files it needs to. If you log in via putty and run the following command (assuming this is an Ubuntu droplet) it will set the files to be owned by the user that the web service is run as and should resolve the problem.
On Centos running Apache to serve you can do like above but for the apache user
sudo chown -R apache:apache /var/www/html
hope this helps someone
The command solved my problem. What does www-data.www-data mean? www-data is the group name ,how about the second www-data ?
root@rebuild:~# cat /etc/group www-data:x:33: