title: Problem with debugging ASP.Net application on IIS 7 on Windows 7
body: <p>Few weeks ago I started using VS 2008 (Professional) with Windows 7 (Enterprise). 
  When working with ASP.Net web applications I repeatedly stumble over the following error:</p>
  
  <p>After opening a solution with a web project the <strong>first compilation and debug go perfectly fine</strong>. The second time I try to debug the solution I get the "<strong>Unable to start debugging on the web server. System call failed</strong>" error and solution does not start at all. When I try to debug it again it always shows the same error but sometimes the app actually starts but does not break on the server code at all.</p>
  
  <p>Any ideas why this could happen?
  Thanks a lot for any suggestions.</p>
  
  <p>(I use local IIS and run VS as Administrator)</p>