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dotnet core .net core API, Unable to connect to web server IIS Express

Select your project, right click -> properties -> Debug ,

Then change the App URL to https://localhost:44377 (this number can be the existing one plus one or two)

Save, close Visual Studio, then open it as Administrator (right click on visual studio and choose run as Administrator)

Build and run again, it should work.

I hope this help resolved this issue. If not please let us know.

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