Hi,
thanks for your reply.
At vCloud Director under Help -> About it says v5.1 so I assume it is 5.1
I cannot give you the exactly URL, but it is like https://vcloud.foo.bar
I tried several combinations like 1.5 + /api and 5_1 - /api. If I add the "/api" it gives me a "Fehler im XML-Dokument (1,1)." (Error at xml document (1,1)).
If you or someone else have any ideas please let me know. I will continue to get a successful login. By the way, it works via RESTClient browser plugin.