Enabling SSH on ESXi Hosts

1. Open vSphere client
2. Select ESXi host, then the Configuration tab.
3. Select Security Profile
4. Click on Properties
5. In the Services popup dialog, select SSH and press the Options button
6. Change settings, then click OK when done.

Reference:
http://www.thomasmaurer.ch/2011/08/enable-ssh-on-esxi-5-via-vsphere-client/