Jus12's questions

I have a running amazon ec2 linux instance associated with a keypair (p1) and I have downloaded the private key to my home desktop. Now at work, I created a keypair (p2) on my work desktop and imported the public key to Amazon via the AWS console.

At home, I want to add the public key of keypair p2 to be added to authorized_keys of my AMI instance (which I can currently access only from home). However, I forgot to bring the public key of p2 with me, so is it possible to somehow export this public key from Amazon.

Suppose I have a setup as:

host_1 --- Firewall_1 --- Internet --- Firewall_2 --- host_2

I need to check which ports are open on host_2 from host_1 (which may be blocked by either firewalls)

Is there a tool that comes in two parts (one running on host_1 and other on host_2) that does this for me? It should be something like:

1 Listen to all ports on host_2
2 Try to connect to every port on host_2 from host_1
3 Give a report what ports are allowed.