Step 1 : Log into N99panel. From under N99panel dashboard, click 'List Users'

Step 2 : In the following screen, please click 'SFTP FIlter (IPv4 based)'

Step 3 : In the next screen, you can enter valid IPc4 IP addresses or a CIDR range, with each entry on a single line.

Upon clicking submit, the system will allow future access to only the entered IPs or CIDR ranges

Submitting the box with no entries, disables the SFTP IPv4 filtering