Option for "SSH Server" for Firewall under "Security Profile" ?

Hi,

We have upgraded all ESXi hosts to vSphere 5.1.

Question 1

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We observe that for a particular ESXi host, the option button is avaialbe (others are grey).  We are able to change start up policy and can "start" / "stop" and "restart" that service.

We cannot see any difference between that particular server and other ESXi Hosts. 

Question 2

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We would also like to seek you advice that if we want to connect to SSH console, the proper procedure is to start the SSH Service (Services) and tick the "SSH Server" (Firewall) ?

Thanks