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I am trying to create a console app with SignalR communication.

I have tried this SO answer, I followed the steps and I recive the following error:

There was an error opening the connection:System.InvalidOperationException: You are using a version of the client that isn't compatible with the server. Client version 2.1, server version 1.0.

The error occures at client side.

I am using .NET Framework 4.7.2

any suggesions?

NOTE that's a console app not a web app so I don't have web.config file

user17450256
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  • I would start with getting your SignalR versions in sync. – mxmissile Nov 18 '21 at 21:56
  • What version of SignalR are you using? The latest for .NET Framework is 2.4.2. What kind of client (JS, .NET, etc.) are you using? – eglease Nov 18 '21 at 22:28
  • If you are able to use .NET 5/6, you should do so as the .NET Framework SignalR will no longer be actively developed. – eglease Nov 18 '21 at 22:29

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