I've run into a bit of a block adding vCentre appliances to OpManager 12.1 - I can add the vCentre without issue but it does not automatically add the Esx hosts.  If I then added the Esxi hosts manually an errors is given briefly that the discover is unable to connect to the vCentre web service and there appears to be no link back to the vCentre.  Further (obviously related) I am unable to fetch any of the performance monitors for the Esxi hosts. 

We also have a Windows vCentre with Esxi 5.5 which everything worked fine.

I suspect I am missing something fundamentally in the setup of Esx/VMware with the virtual appliance.

Thanks.