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    <p>SignalR signs both your connection id and your <code>Identity</code> together in order to create a new <code>connectionToken</code> every time you start a new connection. This <code>connectionToken</code> is then sent to the SignalR client as part of the <code>negotiate</code> response.</p> <p>Every time you make a request to SignalR, whether it be a <code>connect</code>, <code>reconnect</code>, or <code>send</code> request, SignalR verifies that your <code>connectionToken</code> matches both your client's connection id AND <code>Identity</code>.</p> <p>The <code>connectionToken</code> is essentially a CSRF token used in order to prevent attackers running third-party websites from surreptitiously making SignalR requests on behalf of shared clients. Obviously this doesn't help if you've enabled SignalR's cross-domain support, but the <code>connectionToken</code> still works the same in this case.</p> <p><a href="https://stackoverflow.com/questions/15349043/signalr-the-connection-id-is-in-the-incorrect-format">Taylor's answer</a> was correct. You should <code>stop</code> and then <code>start</code> your SignalR connection when your client's <code>Identity</code> changes. This will force a new <code>negotiate</code> request which will give your client a new connection id with a new <code>connectionToken</code> signed with your client's updated <code>Identity</code>.</p> <p>P.S. The server-sent events <code>connect</code> request isn't failing because it was established before your client's <code>Identity</code> was changed. The <code>connectionToken</code> is only checked at the request is received, but server-sent events keeps the response open indefinitely. </p>
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    1. POSignalR - The connection id is in the incorrect format when using Windows and Anonymous authentication
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    1. COThanks for clarification.
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    2. COBut the tricky part I found is that both `connect` and `send` are executed after authorization - user calls controller method decorated with `[Authorize]` what provides him a view where calling Hub takes place - so when calling `connect` from Javascript, the user is already authorized. My understanding is that `Identity` is changed before any call to Hub - during MVC action execution.
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    3. COLooking at your stack trace, it is pretty clear that your user's `Identity` has changed between the `negotiate` and the `send` request. This could have happened via an AJAX request or a session timeout.
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