I got this exception with SignalR, deployed in Azure WebSites. It works fine in debug environment. It\'s SignalR 1.0.1 and I use .NET MVC and WebApi
The data
Now in this case, you can now use the extension method MapsHubs() from Microsoft.AspNet.SignalR.SystemWeb package.
MapsHubs()
Microsoft.AspNet.SignalR.SystemWeb
MachineKeyProtectedData will be used instead of the default implementation.
MachineKeyProtectedData