Remote Desktop Protocol (RDP) – is protocol created by Microsoft, which provides a graphical interface for a user. RDP client is available in most operating systems. By default RDP uses 3389 TCP port. Remote Desktop Connection is the official program meant for login via RDP. 

Requirements:

Windows VPS server with Windows 2012 or 2016 R2 OS

Login via Windows computer:

1. Open up your “Remote Desktop Connection” program and select “Show Options”.
2. Enter your login credentials and press “Connect”:

Computer: Your_server_IP
Username: Administrator

3. Enter your server’s password and press “OK”

Login via Linux OS:

If you do not have rdesktop installed, install it with the command bellow. for Ubuntu/Debian use:

apt-get update

apt-get install rdesktop

For CentOS/Fedora:

yum update

yum install rdesktop

Then you can login to your Windows 2008 or 2012 R2 server using this command in the terminal:

rdesktop -u Administrator -p PASSWORD -g 1280x720 YOUR_SERVER_IP

If you have done everything correctly, Windows Server window should open up: