TF400324 TFS Error

I am trying to connect BuildMaster to TFS2013 but I keep receiving the error below. I have tried on multiple machines and I even did a fresh install of Windows Server 2012R2.

Provider error. Could not connect to TFS: Microsoft.TeamFoundation.TeamFoundationServiceUnavailableException: TF400324: Team Foundation services are not available from server http://windows2012r2-1/tfs.
Technical information (for administrator):
Page not found. ---> System.Net.WebException: The remote server returned an error: (404) Not Found.
at System.Net.HttpWebRequest.GetResponse()
at Microsoft.TeamFoundation.Client.Channels.TfsHttpWebRequest.SendRequestAndGetResponse(HttpWebRequest webRequest, WebException& webException)
--- End of inner exception stack trace ---
at Microsoft.TeamFoundation.Client.Channels.TfsHttpWebRequest.ReadResponse(HttpWebResponse webResponse, WebException webException)
at Microsoft.TeamFoundation.Client.Channels.TfsHttpWebRequest.IsAuthenticationChallenge(TfsMessage requestMessage, HttpWebResponse webResponse, WebException webException, TfsMessage& responseMessage)
at Microsoft.TeamFoundation.Client.Channels.TfsHttpWebRequest.SendRequest()
at Microsoft.TeamFoundation.Client.Channels.TfsHttpRequestChannel.Request(TfsMessage message, TimeSpan timeout)
at Microsoft.TeamFoundation.Client.Channels.TfsHttpClientBase.Invoke(TfsClientOperation operation, Object[] parameters, TimeSpan timeout, Object[]& outputs)
at Microsoft.TeamFoundation.Framework.Client.RegistrationProxy.GetRegistrationEntries(String toolId)
at Microsoft.TeamFoundation.Framework.Client.RegistrationService.RefreshMemoryCache()
at Microsoft.TeamFoundation.Framework.Client.RegistrationService.GetRegistrationEntries(String toolId)
at Microsoft.TeamFoundation.Framework.Client.PreFrameworkServerDataProvider.FindServiceLocation(String serviceType, String toolId)
at Microsoft.TeamFoundation.Framework.Client.PreFrameworkServerDataProvider.LocationForCurrentConnection(String serviceType, Guid serviceIdentifier)
at Microsoft.TeamFoundation.Client.TfsConnection.EnsureProviderConnected()
at Microsoft.TeamFoundation.Client.TfsConnection.EnsureAuthenticated()
at Inedo.BuildMasterExtensions.TFS2012.TfsSourceControlProvider.GetTeamProjectCollection()
at Inedo.BuildMasterExtensions.TFS2012.TfsSourceControlProvider.ValidateConnection2()
at Inedo.BuildMasterExtensions.TFS2012.TfsSourceControlProvider.ValidateConnection()

Product: BuildMaster
Version: 4.3.10

Can you verify that:

the TFS services are accessible over port 80
there is no firewall blocking that port
access to the root path is open (e.g. /tfs, you can test this by trying http://windows2012r2-1/tfs/DefaultCollection instead [or whatever collection name you're looking for])