An SSH daemon on your system

The SSH daemon (or server) is installed by default in OpenSolaris 2009.06. To make sure it is activated, go to System→Administration→Services and make sure SSH server (network/ssh) is activated.

The SSH daemon is installed by default on Mac OS X Leopard (10.5). To activate it, you have to go to the System Preferences, then in the section Internet & Networking click on Sharing. Select and activate Remote login.

On Ubuntu, SSH daemon is not installed by default. You first have to install it, the package name is ssh-server. You can either install it using Synaptic Package Manager in your System→Administration menu or using the command line: $ sudo aptitude install ssh-server.

Once installed, the SSH daemon should be active, to verify it, check in System→Administration→Services and make sure Remote shell server (ssh) is activated.