When doing ftp, you may see this message: Append/Restart not permitted, try again, it is because the ftp server doesn’t allow resume upload.
In the case of proftpd, by default, it doesn’t allow for resumed upload for security reasons, but this is useful in daily scenario especially when the network condition is poor.
To turn on the upload resume feature, open the config file: proftpd.conf, and append the below content at the end. And don’t forget to enter a blank new line at the end of the file, proftpd needs it to tell the end of the file, otherwise it will give you a warning: handling possibly truncated configuration data at line.
<Directory /home/tomatosoft/www/file>
AllowStoreRestart on
<Limit LOGIN>
Order allow,deny
Allow from 192.168.10.2
</Limit>
</Directory>
Note: change the directory entry to your own directory and optionally set the value:
Allow from 192.168.10.2