Have you got a proxy configured?
If you do, you need to disable the Proxy to add the vCenter server and accept the certificate. Once you have accepted the certificate you can re-add the proxy and the endpoint will continue to work fine. This occurs even on 8.0.1 HF1.
There is a fix you can get if you register a support case with GSS which fixes this proxy issue (and other proxy issues for the provisioning-service); I assume it will publicly available in HF2/8.1.
I don't think I have a proxy configured, or at least I don't remember setting one up during the initial config. Any ideas where I go to disable it? I'll also check the docs and see if i can find something.
SSH to the appliance and run vracli proxy show.
In the resulting output look for Enabled: true|false.
You can only set it through vracli so if you don't remember doing it it's unlikely to be enabled.
Have you tailed the provisioning-service pod logs to see what's happening?
Similar error is reported when github enterprise integration is attempted. Not sure if there is a way to manually import the certificate and then attempt the integration.
I just ran into the same issue. Were able to resolve it? Disabling the proxy didn't help in my case.