VS 2012 Express unable to launch IIS Express Web server

I installed Visual Studio 2012 RTM.
Created an MVC 4 project template in Visual Studio 2012
Without any code changes, I hit F5 debug.
Issue: I get a pop up message ”Unable to launch the IIS Express Web Serve

After much searching and many suggest re-install Visual Studio 2012, but it takes a long time (>20 mins) and I’m pretty stubborn at times to find root cause.

I found myself looking at the applicationhost.config file located at

Look for <applicationPools> node.

I updated managedRuntimeVersion=”4.0″ to “4.0.30319″

<add name=”Clr4IntegratedAppPool” managedRuntimeVersion=”v4.0.30319″ managedPipelineMode=”Integrated”     CLRConfigFile=”%IIS_USER_HOME%\config\aspnet.config” autoStart=”true” />

Back to Visual Studio 2012 Project Solution, I hit F5 Debug and IE loaded with the App!


hi there, I am software engineer, working in e-commerce company and passionate about all thing digital. On this blog, I share my experiments with different technology.

Tagged with: , ,
Posted in General

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

What people say about post?
seo hizmeti on Awesome wordpress ecommerce…

Enter your email address to subscribe to this blog and receive notifications of new posts by email.

Join 39 other followers

%d bloggers like this: