How to solve ERR_CONNECTION_REFUSED when trying to connect to localhost running IISExpress - Error 502 (Cannot debug from Visual Studio)?

Try changing the port number in your project?

Project Properties → Web → Servers → Project Url:

Don't forget to click Create Virtual Directory, or reply "Yes" to the prompt for creating virtual directory after you change your port number! (Thanks Connor)

Note: I'm a little reluctant to post this as an answer, as I have no idea what the issue is or what caused it, but I had a similar issue, and changing the port number did the trick for me. I'm only posting this per the suggestion in the comments that this worked for someone else as well.

In my case, it seemed like something was conflicting with the specific port number I was using, so I changed to a different one, and my site popped right back up! I'm not sure what that means for the old port number, or if I'll ever be able to use it again. Maybe someone more knowledgeable than myself can chime in on this.

Thanks for all the answers. I tried all of them but none of them worked for me. What did work was to delete the applicationhost.config from the .vs folder (found in the folder of your project/solution) and create a new virtual directory (Project Properties > Web > Create Virtual Directory). Hope this will help somebody else.

This issue may be because in the recent past you have used IP address binding in your application configuration.

Steps to Solve the issue:

• Run below command in administrator access command terminal

netsh http show iplisten

If you see some thing like below then this solution may not help you.

IP addresses present in the IP listen to list:

0.0.0.0

If you see something different than 0.0.0.0 then try below steps to fix this.

• Run following shell command in order with elevated command terminal

netsh http delete iplisten ipaddress=11.22.33.44

netsh http add iplisten ipaddress=0.0.0.0

iisreset

• (Here 11.22.33.44 is the actual IP that needs to be removed)

And now your issexpress is set to listen to any ping coming to localhost binding.