The maximum queue length for HTTP.sys for each IIS 8.5 website must be explicitly configured.

From IIS 8.5 Site Security Technical Implementation Guide

Associated with: CCI-000366

SV-91571r1_rule The maximum queue length for HTTP.sys for each IIS 8.5 website must be explicitly configured.

Vulnerability discussion

In order to determine the possible causes of client connection errors and to conserve system resources, it is important to both log errors and manage those settings controlling requests to the application pool.

Check content

Open the IIS 8.5 Manager. Perform for each Application Pool. Click the “Application Pools”. Highlight an Application Pool to review and click "Advanced Settings" in the "Actions" pane. Scroll down to the "General" section and verify the value for "Queue Length" is set to 1000. If the "Queue Length" is set to "1000" or less, this is not a finding.

Fix text

Open the IIS 8.5 Manager. Click the “Application Pools”. Highlight an Application Pool to review and click "Advanced Settings" in the "Actions" pane. Scroll down to the “General” section and set the value for “Queue Length” to “1000” or less. Click “OK”.

Pro Tips

Lavender hyperlinks in small type off to the right (of CSS class id, if you view the page source) point to globally unique URIs for each document and item. Copy the link location and paste anywhere you need to talk unambiguously about these things.

You can obtain data about documents and items in other formats. Simply provide an HTTP header Accept: text/turtle or Accept: application/rdf+xml.