Symptom



Cause


The appConcurrentRequestLimit property is set to a value that is lower than the current number of concurrent requests. IIS 7.0, IIS 7.5, and IIS 8.0 do not allow more concurrent requests than the value of the appConcurrentRequestLimit property.



Resolution


Increase the connection limit options in IIS manager

  1. Open Internet Information Services (IIS) Manager: 

    • If you are using Windows Server 2012 or Windows Server 2012 R2: 

      • On the taskbar, click Server Manager, click Tools, and then click Internet Information Services (IIS) Manager.

    • If you are using Windows 8 or Windows 8.1: 

      • Hold down the Windows key, press the letter X, and then click Control Panel.
      • Click Administrative Tools, and then double-click Internet Information Services (IIS) Manager.

    • If you are using Windows Server 2008 or Windows Server 2008 R2: 

      • On the taskbar, click Start, point to Administrative Tools, and then click Internet Information Services (IIS) Manager.

    • If you are using Windows Vista or Windows 7: 

      • On the taskbar, click Start, and then click Control Panel.
      • Double-click Administrative Tools, and then double-click Internet Information Services (IIS) Manager.
  2. In the Connections pane, and then click the Sites node.
  3. In the Sites pane, click Set Web Site Defaults... in the Actions pane.
  4. In the Web Site Defaults dialog box, expand Limits, specify limit options, and then click OK.