Launch Pagent form the folder putty in the start menu
 

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The first time nothing append it's normal ! 
 
Just go to the right bottom of you screen. You will see the pagent icon

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Do a right click on the icon 

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And select Add Key

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Select you private key (.pkk file)

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When it's done  open putty

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Enter the IP of the server :

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Use username root

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You will be directly connected to the VM 

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