I am developing live chat using SignalR. It is great library. But i coped with one problem that I cant resolve for some time. So problem in when signalR made 8-10 connection
IIS/Cassini on Windows 7 has a default limit of 10 concurrent connections. Try running tests on Windows Server and see if it behaves the same.
Try opening the connections in separate browser windows and/or separate browsers and/or machines, not tabs. I noticed that in 0.4 things can mess up when using tabs.