Determining why a request was blocked

If you want to investigate why a request was blocked, information is available in the block page source code.

• If the block page was sent by Filtering Service (for requests handled by the appliance or on-premises software), click More information. Next, right-click anywhere in the message text and select View Source. See Request blocked by Filtering Service.
  Note: With Internet Explorer 10, the View Source option is not always available. If the View Source option does not appear, click Page Tools and select View on the desktop.
• If the block page was sent by the hybrid service, right-click anywhere in the block message and select View Source. See Request blocked by the hybrid service.