Odd error with plugin vCenter Server 5.1

Hi,

I have installed orchestrator appliance 5.1 with vCenter plugin. Everything is green and seems well configured.

I am able to connect myself with the vCenter client and access all my workflows !

But when I access the plugin parts and wants to explore the vCenter Server, orchestrator returns me this error :

I do not understand why. The user that I configured in the vCenter plugin configuration is an administrator and has all privileges...

Have you got any idea ?

Thanks for your help.

Regards