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IIST-SI-000229: Prohibit double encoded URL requests

Double encoded URL requests must be prohibited by any IIS 10.0 website.
To check compliance with IIST-SI-000229, complete the following steps for each site hosted on the IIS 10.0 web server:
  1. Open the IIS 10.0 Manager.
  2. Click the site name.
  3. Double-click the
    Request Filtering
    icon.
  4. In the
    Actions
    pane, click
    Edit Feature Settings
    .
If the
Allow double escaping
option is selected, your application is not compliant.
If your application is not compliant, complete the following steps:
  1. Open the IIS 10.0 Manager.
  2. Click the site name.
  3. Double-click the
    Request Filtering
    icon.
  4. In the
    Actions
    pane, click
    Edit Feature Settings
    .
  5. Deselect the
    Allow double escaping
    option.