ssh -i "LightsailDefaultKey-ap-south-1.pem" bitnami@[ip-of-lightsail-instance]
ssh: connect to host 6[ip-of-lightsail-instance] port 22: Connection timed out

UPSTREAM\_NOT\_FOUND
An error occurred and we were unable to connect or stay connected to your instance. If this instance has just started up, try again in a minute or two.
UPSTREAM\_NOT\_FOUND [519]

PUTTY says
Connection Timeout