I recently ran into an issue where I could no longer FTP files to my Linux droplet when multiple users were uploading to the server. The server kept the user as the owner despite me adding them to the www-data group. This fix comes from my ex-boss, James Tomasino who was kind enough to provide some help since I was stumped. I’m sharing in case anyone else runs into the same issue and finds it useful.

You’ll need to fire up terminal, ssh to the server, and then execute these commands:

cd /var/www
sudo chmod 775 html
sudo chgrp www-data html
sudo chmod g+s html

+s makes permissions sticky so that all files will inherit from the parent directory. This was the setting I was missing.

Open up /etc/ssh/sshd_config. I use nano so:

sudo nano /etc/ssh/sshd_config

Hit CTRL+W and look for “subsystem” which is typically located near the bottom of the file. Change

subsystem sftp /usr/lib/openssh/sftp-server

to

subsystem sftp /usr/lib/openssh/sftp-server -u 0002

If you already have files in the HTML folder, you’ll want to run these commands to reset the permissions:

cd /var/www/
sudo chgrp -R www-data html
find . -type f -exec chmod 664 {} \;
find . -type d -exec chmod 775 {} \;