Server Side

Install the latest version of openssh and openssh-server

mkdir –p /sftp/user/                        #create folder for sftp access for the specified user
adduser user                                         #add user
passwd user                                           #change password for the user

groupadd sftpusers                           #add group
usermod –a –G sftpusers user     #add user to group
id user                                                  #check if the user is member of the group
 
usermod –d /sftp/user user         #set home directory for user
 
vi /etc/passwd
      user:x:yyy:zzzz::/sftp/user/:/sbin/nologin
 
vi /etc/ssh/sshd_config
      Comment the line
      Subsystem sftp /usr/libexec/openssh/sftp-server
     
      Add the following lines
      Subsystem sftp internal-sftp
        Match Group sftpusers
            X11Forwarding no
            AllowTCPForwarding no
            ChrootDirectory /sftp/%u
            ForceCommand internal-sftp
 
systemctl restart sshd
systemctl enable sshd
 

Client Side

Install the latest version of openssh

Connect to the sftp server
      sftp user@<hostname/public_IP>                                                #if sftp port is default 22
      sftp –oPort=<port> user@<hostname/public_IP>               #if sftp port is other than 22