http://developers.de/blogs/damir_dobric/archive/2013/03/08/why-does-signalr-hubs-return-404.aspxWhen working with SignalR hubs probably your first experience will be HTTP Error File not found (snapshot from Fiddler). This happen when java script reference tries to download dynamically created hub.js file which helps you to easily deal with hub proxiesenCommunityServer 2008 SP1 (Build: 30619.63)