Unable to start debugging on the web server. The server committed a protocol violation. Section=ResponseStatusLine

Normally when you install Skype on your system, your IIS stops functioning. The reason is that your IIS is running on port 80 and 443 and so as Skype, so if before opening any of your local website in your IIS you turn your Skype on, & then try to browse your local website you may get "404 error" or When try to debug in IIS, visual studio returns following error "Unable to start debugging on the web server. The server committed a protocol violation. Section=ResponseStatusLine"

It was interesting notice that Skype is already occupying the port 80.
So IIS is unable to start. For removing this error

Go to Skype -> Tools -> Options -> Advanced -> Connection 

Please un-tick "Use port 80 and 443 as alternatives for incoming connections" - Check box

Hope this may help you as it helped me or even if this won't do check that any other application is not occupying the same port which IIS required for running its Secure or non Secure websites.

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