ADD upload user

sudo useradd -d /home/upload -p $(perl -e'print crypt("upload", "df")') upload

sudo mkdir /home/upload

sudo chown upload:upload /home/upload

Edit /etc/sshh/sshd_config to disable to disable ssh-connection of nand

Match user nand

ForceCommand /bin/false

PasswordAuthentication no

PubkeyAuthentication no