SignalR version compatability (StatusCode: 405 ‘Method Not Allowed’)

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You can’t mix the .NET Core 1.x with the older client (1.x or 2.x). You will need to decide which is the best option for you but you need to implement the same compatible version across CLIENT and SERVER.

Check the link for more details but essentially:

What’s Changed?

We added a number of new features to SignalR for ASP.NET Core but we
also decided to remove support for some of the existing features or
change how they work. One of the consequences of this is that SignalR
for ASP.NET Core is not compatible with previous versions of SignalR.
This means that you cannot use the old server with the new clients or the old clients with the new server.

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