ERR_CONNECTION_RESET with IIS express in Visual Studio 2017

Question

We´ve created a ASP.Net Core Web App and added some controllers. For some reason when I want to run the application, it connects to my local IIS express and the only message that occurs is the following

ERR_CONNECTION_RESET

I don´t try to connect to the port via SSL, so I don´t think it´s a certificate issue.

It doesn´t matter which controller I try to call. For some reason this behaviour appears just on my machine. If I create a new Wep App it works perfectly fine.

I tried the following steps:

• Changed the port number in the web server settings in the project properties
• Uninstalled IIS Express and reinstalled it
• Deleted the hole .vs folder in my project
• Host the web app on my local IIS Server
• Compared the hole project settings with the project settings of a machine, where it runs fine

I´m stuck on this problem for 2 days now and don´t want to reinstall VS2017. Maybe it´s just a little thing which I´ve missed.

Thanks for your replies :)

Answer 1

If your problem is: ERR_CONNECTION_RESET and you said you tried:

Changed the port number in the web server settings in the project properties

Consider that IIS express reserve ports in the range 44300 to 44399.

I had exatly the same ERR_CONNECTION_RESET when i set IIS Express port out of this range. The solution was to put port number inside this range. Hope it helps you.

Answer 2

The problem was based on my Visual Studio instance. Reinstalling Visual Studio + repairing after this over the VS-installer solved my problem