My identity domain : inchangepo88915
Service Name : muruga
Able to create public/private key pair .
Also gone with steps as from "Connecting to a Compute Node Using the PuTTY Program on Windows"
Even so I'm getting error in putty as "Network error:connection timed out"
Also I'd like to point you out " In SSH public key field public key validation got success in 'Service details' page "
Note : I did use "puttygen" tool to generate keys in my local windows desktop