WampSharp.AspNetCore.WebSockets.Server uses deprecated websockets package: Microsoft.AspNetCore.WebSockets.Server. Please update it to Microsoft.AspNetCore.WebSockets package (https://www.nuget.org/packages/Microsoft.AspNetCore.WebSockets/1.0.0). More details: https://github.com/aspnet/IISIntegration/issues/240