localhost refused to connect Error in visual studio

Solution 1:

I had a similar issue. Try this and it should work

1. Go to your project folder and open the .vs folder (keep your check hidden item-box checked as this folder may be hidden sometimes)

2. In the .vs folder open the config folder

3. See that applicationhost.config file there? Delete that thing. (Do not worry it will regenerate automatically once you recompile the project.)

Solution 2:

Usually on local machine we are getting errors like This site can't be reached localhost refused to connect because we have self signed certificate configuration broken for local IIS Express. Sometimes it happens when you change URLs in launchSettings.json or never configured self signed certificates on this machine at all.

To fix self-signed certificate on the local machine you need to: 

1. Delete .vs folder (requires to close Visual Studio 2017)

2. Run these commands in cmd As Administrator:

   cd "C:\Program Files (x86)\IIS Express"

   IisExpressAdminCmd.exe setupsslUrl -url:https://localhost:12345/ -UseSelfSigned

3. Make sure you run VS2017 As Administrator and check if the issue addressed

Note: https://localhost:12345/ is what is in your launchSettings.json for HTTPS

Solution 3:

Changing port number has resolved the issue