asp.net - SignalR: WebSockets is unsupported in the current application configuration -


i'm using signalr 2.1.2 in project. ok, today saw notifications don't work in project. tried troubleshoot issue checked windows event viewer , saw error:

exception information:      exception type: invalidoperationexception      exception message: websockets unsupported in current application configuration. enable this, set following configuration switch in web.config: <system.web>   <httpruntime targetframework="4.5" /> </system.web>....

i have searched lot issue. can see error message tells set targetframework, didn't result.
ps: have problem in both local version , published version.

after long time debugging figured out. forgot establish connection:

$.connection.hub.start()  });

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