title: For Apache listening on port 81 - "The requested URL / was not found on this server"
body: <p>Debian 6, nginx and Apache (port 81). Domain opening falls with a 404 error:</p>
  
  <blockquote>
    <p>Not Found The requested URL / was not found on this server.</p>
  </blockquote>
  
  <p>Apache2 configuration:</p>
  
  <pre><code>&lt;VirtualHost *:81 &gt;
      ServerName domain.com
      AssignUserID user user
      CustomLog /var/www/httpd-logs/domain.com.access.log combined
      DocumentRoot /var/www/user/data/www/domain.com
      ErrorLog /var/www/httpd-logs/domain.com.error.log
  
      ServerAdmin info@domain.com
      ServerAlias www.domain.com
  
      AddType application/x-httpd-php .php .php3 .php4 .php5 .phtml
      AddType application/x-httpd-php-source .phps
  
      php_admin_value open_basedir "/var/www/user/data:."
      php_admin_value sendmail_path "/usr/sbin/sendmail -t -i -f info@domain.com"
      php_admin_value upload_tmp_dir "/var/www/user/data/mod-tmp"
      php_admin_value session.save_path "/var/www/user/data/mod-tmp"
  &lt;/VirtualHost&gt;
  </code></pre>
  
  <p>What could be the problem?</p>