There are two ways to enable the SSH server on a VMWare ESX host, through the vSphere client or through direct access through the console.
Use this method if you have access to the host directly through console, or when you can use a remote management system such as HP's Integrated Lights-Out or Dell's iDRAC.
If you can't log on using the vSphere client, this is the only way to enable the SSH server.
You can disable the SSH service by performing the same actions as above.
To disable through the vSphere client, perform steps 1-4, then click the Stop button to immediately stop the SSH server. To make the change permanent (i.e. so the SSH service does not start after a reboot of the host), set the startup policy to Start and stop manually.