ProFTP – set group owner on uploaded files
In proftpd.conf, you could have some virtual host’s
If you have, groupowner is set in this way:
<VirtualHost 10.0.0.30>
DefaultRoot ~
MasqueradeAddress 80.xx.xx.xx
PassivePorts 64000 65000
Port 21
<Directory />
AllowOverwrite on
</Directory>
<Directory /www>
GroupOwner www-data
Umask 002 003
</Directory>
</VirtualHost>