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Editorial Team
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Asked: 2026-06-17T19:07:28+00:00

I’m trying to achieve the following: 1. Server (WinForms for now) that hosts a

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I’m trying to achieve the following:
1. Server (WinForms for now) that hosts a SignalR persistent connection
2. ASP.NET MVC client

The server runs on port 8000 and the client runs (via Visual Studio) on port 22914.
But when I test this, I get the following error: 

XMLHttpRequest cannot load http://localhost:8000/echo/negotiate?_=1352825948654. Origin http://localhost:22914 is not allowed by Access-Control-Allow-Origin.

So far so good, I need to specify that Cross Domain communication is allowed. I assume this needs to be done on the server. But where and how?
I can’t find a solution and unfortunately, there aren’t a lot of resources on the web about self hosting a SignalR connection in a WinForms app.

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1 Answer

  1. Editorial Team

    I recently encountered this problem myself; the answer is to specify the Server Url and Port in your Client application, i.e for the following scenario:

    Server: http://localhost:8000/

    Client: http://localhost:22914/

    Client Application:

    $.connection.hub.url = 'http://localhost:8000/signalr'

$.connection.hub.start();

    Documented at the bottom of the SignalR Client Hubs Wiki on Github

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