Error 203 when connecting to TFS

Hi,

It's been a while since the last time I used Test Studio, so I updated to the latest version. 2015.3.1217.0.

Now I can't connect to Team Foundation Services and receiving the error: HTTP code 203: Non-Authoritative Information (See log below and check attached screenshot). Please note that I'm using visual studio online and I have no issues when connecting from VS 2015.

I hope someone faced the same issue than me and solved it. Not much info can be found on the web... 

[01/12 17:21:32,Telerik.TestStudio.Desktop.exe(11216:19),TeamFoundationServer] TFSServer.ConnectToServer() : EXCEPTION! (see below)
Situation: Exception connecting to TFS server
Outer Exception Type: Microsoft.TeamFoundation.TeamFoundationServiceUnavailableException
Message: Team Foundation services are not available from server https://XXXXXXXXXXXXXXX.visualstudio.com/defaultcollection.
Technical information (for administrator):
HTTP code 203: Non-Authoritative Information
HRESULT: 0x80131600 (Official ID (if app.) = COR_E_APPLICATION, Error Bit = FAILED, Facility = FACILITY_URT, Code = 5632)
Call Stack:
at Microsoft.TeamFoundation.Client.TeamFoundationClientProxyBase.ProcessHttpResponse(HttpWebResponse response, Stream responseStream, WebException webException, XmlReader& xmlResponseReader)
at Microsoft.TeamFoundation.Client.TeamFoundationClientProxyBase.ExecWebServiceRequest(HttpWebRequest request, XmlWriter requestXml, String methodName, HttpWebResponse& response)
at Microsoft.TeamFoundation.Framework.Client.LocationWebService.Connect(Int32 connectOptions, ServiceTypeFilter[] serviceTypeFilters, Int32 lastChangeId)
at Microsoft.TeamFoundation.Framework.Client.FrameworkServerDataProvider.Connect(ConnectOptions connectOptions)
at Microsoft.TeamFoundation.Framework.Client.FrameworkServerDataProvider.EnsureConnected(ConnectOptions optionsNeeded)
at Microsoft.TeamFoundation.Framework.Client.FrameworkServerDataProvider.EnsureAuthenticated()
at Microsoft.TeamFoundation.Client.TfsConnection.<EnsureAuthenticated>b__0()
at Microsoft.TeamFoundation.Client.TfsConnection.UseCredentialsProviderOnFailure(Action action)
at Microsoft.TeamFoundation.Client.TfsConnection.EnsureAuthenticated()
at Microsoft.TeamFoundation.Client.TeamFoundationServer.EnsureAuthenticated()
at ArtOfTest.Common.TFSClient.TFSServer.ConnectToServer(IServerInfo server)

[01/12 17:21:32,Telerik.TestStudio.Desktop.exe(11216:19),TeamFoundationServer] TFSServer.ConnectToServer() : ------- Function End -------