Under "Session," in the "Host Name (or IP address)" field, type the IP address or hostname of your Linux server. Ensure the "Port" field is set to 22, which is the default SSH port. Select SSH under ...

The PuTTY application is now ready to roll. Before I can use it to talk to my EC2 machine, I must convert my private key to a PuTTY-friendly format and load the key into the SSH authentication agent.