'signalr/negotiate 403 - forbidden: access is denied

Any one help me this: On localhost this working, but on IIS, win server 2019 i get signalr/negotiate 403 - forbidden: access is denied. Note that I use MVC 5 asp.net, not asp.net core

On file Startup, I add app.MapSignalR();

[enter image description here][1] [1]: https://i.stack.imgur.com/WxOkU.jpg

Thank you for your help!



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