Accessing Solarwinds Information Service

So i am trying to access the solarwinds information service so i can get the assembly in my C# project however when i try to add the service reference i get the following error

:17778/SolarWinds/InformationService/v3/_vti_bin/ListData.svc/$metadata'.

The request failed with HTTP status 405: Method Not Allowed.

I am not sure how i can auth to this service or even setup anonymous access to get the references in my project so any help would be awesome.

I was also thinking i can just add the references from the sample but i am not 100% sure.

I can see the site when i access directly as :17778/SolarWinds/InformationService/v3 and it shows that the service was created and i can access it through the url and even shows a quick example of how to open the connection.