Virtual Private Server / Cloud Server

Cloud Server / VPS - Virtual Private Server in Cloud

It's really nice and easy to get 2 months free from DigitalOcean ($10 starting budget) or also you can try Amazon Free-Tier's or Google Cloud. And don't forget Azure.

ssh -l <username> <ipaddress>

sudo apt-get install knockd

sudo nano /etc/default/knockd

change START_KNOCKD=0 >>> 
START_KNOCKD=1

sudo service knockd start

 knock <server_ip_address> 65123 65321 65123

sudo nano /etc/knockd.conf

sudo service knockd restart

::Final Command::

knock <server_ip_address> 5438 3428 3280 4479 && ssh <user>@<server_ip_address>