Recently, I came across an issue while configuring a new instance of VDP 6.1.8 appliance while performing vCenter Registration to the vCenter appliance 6.5 with an external Platform Services Controller.
below is the error message I have been getting
I have provided the administrator account user credentials to the VCSA (vCenter server) with the default ports but still received the error.
Upon some deep troubleshooting, found out that the SSO server is the Platform Services Controller (PSC) since my environment had an external PSC and here is how you resolve this issue:
De-select the checkbox “Use vCenter for SSO authentication”, and add the Platform Services Controller hostname/IP in the new SSO entry line.
Now, you can test the connection and it will be a success
This is how the issue was resolved. Hope it helps someone out there.
This is with VDP version 6.1.8 connecting to VCSA 6.5 with External PSC
Converged, Hyperconverged Infrastructure & Virtualization 