at DotNetOpenAuth.Messaging.StandardWebRequestHandler.GetResponse(HttpWebRequest request, DirectWebRequestOptions options) at DotNetOpenAuth.Messaging.Channel.RequestCore(IDirectedProtocolMessage request) at DotNetOpenAuth.Messaging.Channel.Request(IDirectedProtocolMessage requestMessage) at DotNetOpenAuth.Messaging.Channel.Request[TResponse](IDirectedProtocolMessage requestMessage) at DotNetOpenAuth.OAuth.ConsumerBase.PrepareRequestUserAuthorization(Uri callback, IDictionary`2 requestParameters, IDictionary`2 redirectParameters, String& requestToken) at DotNetOpenAuth.AspNet.Clients.DotNetOpenAuthWebConsumer.RequestAuthentication(Uri callback) at BusinessInternational.Controllers.SocialController.LinkedIn(String oauth_token) in E:\Progetti\BusinessInternational\BusinessInternational\Controllers\SocialController.cs:line 141