Users can use access SCARF using an ssh key. This page explains how to create an ssh key, what part of it and in what format is needed by the site administrators to enable your access. Generating ssh key on Linux...
If you want to connect your gce (google-cloud) server with putty using root, here is the flow: use puttygen to generate two ppk files: for your gce-default-user for root do the followings on putty (replace gce-default-user...