title: Upgrade Error: ERROR: Could not connect to database specified in connectionString for SqlDataProvider In dotnetnuke
body: <p>I am trying to install dot net nuke in my local system (windows XP). I have IIS and sql server 2005 express. </p>
  
  <p>I have followed the instruction and all are done. While running the dotnetnuke i.e. <a href="http://localhost/DotNetNuke500-1/install/install.aspx" rel="nofollow noreferrer">http://localhost/DotNetNuke500-1/install/install.aspx</a> I got the following error message</p>
  
  <blockquote>
    <p>Upgrade Error: ERROR: Could not connect to database specified in connectionString for SqlDataProvider</p>
  </blockquote>
  
  <p>I don't know what is the reason.</p>