title: The remote computer refused the network connection Error
body: <p>I am getting this connection <a href="https://pasteboard.co/GCJGbv0.png" rel="noreferrer">error</a> when I open the web application</p>
  
  <p>This is my connection string</p>
  
  <pre><code>   &lt;add name="DBCS" connectionString="Data Source=ABC-DEF;Initial Catalog=DB;
  Integrated Security=True;MultipleActiveResultSets=true" 
      providerName="System.Data.SqlClient"/&gt;
  </code></pre>
  
  <p>Also to add, the site was working fine, this error is sudden. 
  I have tried restarting the <code>sql-server</code> services and also set static <code>tcp</code> port. 
  Still does not work. 
  Where is the error?</p>