As per Operating System
Linux distributions include support for SSH by default as well. Simply start up a terminal.
Mac OS X includes the SSH client Terminal by default.
Window Server does not provide this features by default, you need to Download Putty for window
For login to our linux server through Secure Shell (SSH)
You need to enable the SSH
How to enable the SSH at plesk 10 control panel
Login to the plesk administrator panel
Click On the Server option at Upper menu.
Under Tools & Settings ==>Tools & Resources==>Click on Firewall
Please check SSH (secure shell) server is enable with green color
If not enabled then click on Edit Firewall Configuration and enabled it.
Then run your putty and fill with the details
Type your host name or fill with IP
After click on ok button you will reach with one command window with
Login as :
and Password root@your IP or servername