which version of Visual Studio you are using?? 

Hi,

To better understand your issue, please confirm the following information:

If we create another type project, does it have any issue?

Do any virus software in your machine to prevent Asp.Net Development Server? If so, you can try to reconfigure your virus software.

You also can try to refer to http://connect.microsoft.com/VisualStudio/feedback/Workaround.aspx?FeedbackID=102138

I hope this helps.  

I had trouble connecting to the Internet also. I finally found the solution with a Google search (on a borrowed computer). Turns out that my winsock had become corrupted. Since fixing that, VWD seems to be doing better.