Ok this looks fine to me.
What verson is your vCenter Server running (5.1 / 5.0)?
Have you tried a local admin-user for connecting via vCenter Server plugin?
Could you post a screenshot of the "Permissions"-Tab in vSphere (vCenter Server), please?
This is very strange, because of the "unexpected status code 301" message.
Maybe you could try to setup a brand new vCenter (using vCenter appliance) trying to connect from Orchestrator again
or
Reinstall the vCenter Server plugin.
... bump ...