Visual studio 2017 "Unable to connect to web server 'IIS Express'"
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!
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.
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.
I know there is already an accepted answer to this question, but none of the solutions worked for me and my solution may help someone. I am using VS2017 with an ASP.NET Core 2.0 Razor Pages project.
The error just started appearing for no obvious reason, and I tried the solutions posted here.
I ran the web app from the command line using the dotnet run command to see if that would bring up any meaningful errors, and there was a warning about the URL not being correctly bound. I looked in my projects Properties\launchSettings.json file and noticed that the applicationUrl properties were different.
- Change the values for applicationURL so they are the same
- Close the project and close VS
- Delete the hidden .vs folder (as mentioned in the accepted answer)
- Start up VS as Admin
Your app should work fine.
I was having the issue on Visual Studio 2019 with a clean branch from master. Restarting the PC solved the problem.
My college said he is having the problem about 2 times a month and other tries for solutions did not work.