The default configuration of PureFTP on cPanel/WHM server restricts the number of FTP concurrent connections from a single IP address to 8.
This article explains how to increase the number of allowed concurrent connections for a single IP address.
1. Backup PureFTP configuration
# cp /etc/pure-ftpd.conf /etc/pure-ftpd.conf~
2. Edit PureFTP configuration
(You can use nano, pico or another editor if you prefer, however this example uses vi.)
vi /etc/pure-ftpd.conf
Scoll to comment marked "Maximum number of sim clients with the same IP address"
Change
MaxClientsPerIP 8
To
MaxClientsPerIP 20
4. Save the file
5. Reload the FTP server
/etc/init.d/pure-ftpd restart
The server should now accept up to 20 concurrent connections from the same IP address.