Unable to add a new proxy agent

Hello,

I'am trying to add a new vsphere proxy agent in vRA and i'm facing some issues.

I followed the vmware documentation and also several comments on various blogs (like Adding Additional vCenter Instances to vRealize Automation | ValCo Labs)

and i always get this error when trying to "test" the model manager web service host name or manager service

I tryed to launch the setup on another computer, i get the same error.

It seem to come from my IAAS server, but everything seems to be OK

For information, all services are installed on the same W2K12 VM except the DB that remains on another server.

Did someone has an idea ?

thanks