No se puede conectar con el servidor web de desarrollo configurado. Salida de IIS Express Web server, Failed to register URL, Access is denied

 No se puede iniciar el sitio web por que se requiere privilegios administrativos para enlazar al nombre de host o puerto

Solucion:

Reiniciar el servicio WinNAT.

Iniciar cmd como administrador:

net stop winnat

net start winnat

Error MSB3644 The reference assemblies for .NETFramework,Version=v4.7 were not found.

Severity Code Description Project File Line Suppression State

Error MSB3644 The reference assemblies for .NETFramework,Version=v4.7 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks GestionInventario.WebApi C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\MSBuild\Current\Bin\Microsoft.Common.CurrentVersion.targets 1180  

Descargar he instalar:

https://dotnet.microsoft.com/download/dotnet-framework/thank-you/net47-developer-pack-offline-installer

The reference assemblies for framework “.NETFramework,Version=v4.6.2” were not found

 Error MSB3644 The reference assemblies for framework ".NETFramework,Version=v4.6.2" were not found. To resolve this, install the SDK or Targeting Pack for this framework version or retarget your application to a version of the framework for which you have the SDK or Targeting Pack installed. Note that assemblies will be resolved from the Global Assembly Cache (GAC) and will be used in place of reference assemblies. Therefore your assembly may not be correctly targeted for the framework you intend. C:\RPR\Dev\Libraries\Common\Common.csproj C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\MSBuild\15.0\Bin\Microsoft.Common.CurrentVersion.targets 

Resulta que había instalado .NET Framework v4.6.2, no el Developer Pack para 4.6.2.

https://www.microsoft.com/en-us/download/details.aspx?id=53321

Visual Studio desactivar debug ContextSwitchDeadlock

 Error al debugear

Managed Debugging Assistant 'ContextSwitchDeadlock'    Message=Managed Debugging Assistant 'ContextSwitchDeadlock' : 'The CLR has been unable to transition from COM context 0x8e0158 to COM context 0x8dffe8 for 60 seconds. The thread that owns the destination context/apartment is most likely either doing a non pumping wait or processing a very long running operation without pumping Windows messages. This situation generally has a negative performance impact and may even lead to the application becoming non responsive or memory usage accumulating continually over time. To avoid this problem, all single threaded apartment (STA) threads should use pumping wait primitives (such as CoWaitForMultipleHandles) and routinely pump messages during long running operations.'

Debug > Windows > Exception Settings

Reporting services en visual studio 2019

 Para poder ver los proyectos de reportes en VS 2019 es necesario instalar el siguiente complemento.

Extensions/ Manage Extensions

Xamarin.Android para Visual Studio requiere Android SDK

Descripcion del error
Error de estado de supresión de línea Xamarin.Android para Visual Studio requiere Android SDK. 
Instálelo o configure la ruta del SDK de Android en Herramientas-> Opciones-> Xamarin-> Menú de configuración de Android. 0  

Seguí el error en el campo en el que puede ingresar la ruta al SDK. Le doy la ruta, pero luego ocurre otro problema. Hay una X al lado de la ruta. Esto ocurre después de la última actualización de Visual Studio 2017

Solución.
Ejecutar Visual Studio Instaler, desintalar el sdk mas reciente, volver a abrir el sdk e instalar de nuevo el sdk... eso soluciono el problema.