Unable to connect ssh

ກໍລະນິເຂົ້າ ssh ບໍ່ໄດ້ແບບຖືກ reject ຈາກເຄື່ອງ ຕົວຢ່າງ

ghost@shit:~$ ssh admin@xxx.xxx.xxx.xxx
ssh_exchange_identification: Connection closed by remote host


ໃຫ້ແອດ

echo 'SSHD: ALL' >> /etc/hosts.allow

ແລ້ວ run
ssh admin@xxx.xxx.xxx.xxx  -v