iiswebserver

unable to launch iis express web server port 80 is in use

I have MVC4 web application project in visual studio 2010. When I want to start it, I have the following error:

Unable to launch the IIS Express Web server: Port"80" is in use.

The problem came after changing the property "Use Local IIS Webserver"

Solution

  • http://blog.lextudio.com/2012/10/port-already-in-use-then-who-uses-it/

    If you already have something monitoring port 80 (such as full IIS), then you cannot use another thing to monitor the same port.

    Thus, if you do want to use IIS Express, make sure in Project Url: field you specify another port number other than 80.