Hi, thanks for sending the link , but the reason I posted this question is because the information on that link does not make sense.
According to the documentation, it is a prerequisite, not a optional feature. Also, it doesnt stat what needs to have a FQN. The link you sent implies that only the vcenter appliance needs to have the FQN resolvable, but I have seen other posts saying that the vsphere server needs to have a fqn and it needs to have a reverse lookup also (which is not stated in this link)?
The link states that the FQN is optional, in which case why is listed in pre-requisites, and why does everyone say if its not setup, it wont work?