Visual studio 2017 "Unable to connect to web server 'IIS Express'"

Question

If I attempt to launch my .net core app I get this message. I realize there are many posts out there claiming to fix this but I have tried every method they suggest and none are working.

If I go into the project properties under debug and change the port, then it will connect 1 time. Then if I attempt to connect again, it will give me the same error again. I can then switch the port back to the original and it will load one time, then it will fail any time beyond that, until I switch it again. Anyone have any ideas or fixes they used?

Thanks!

Answer 1

I had this problem. There is a hidden folder in directory of project that name is '.vs'. Close the Visual Studio and delete this folder. The problem will be solved.

Answer 2

I installed core 2.0 and updated VS 2017 to 15.4.3 today, had the same error.

I ended up changing the application to run on a different port, it worked for me.

I have tried to delete the vs folder but did not work.

Hope it helps.