Of the 100 ESX 4.1 Hosts in our environment, 5 were showing noncompliant with "Ruleset updateManager doesn't match the specification". I'm not really clear why this worked but, I resolved it by editing the Host profile, (1) selecting the "Flag indicating whether ruleset should be enabled" box and (2) deselecting the "Validate that ruleset updateManager is enabled" (see attached images).
I was unable to find specific information on the updateManager Ruleset. Does anyone have detail as to what this particular Ruleset checks for. I'd like to understand more about why the Hosts were initially noncompliant and then why these modifications fixed it.