The application pool for each IIS 10.0 website must have a recycle time explicitly set.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-100271	IIST-SI-000255	SV-109375r1_rule		Medium

Description
Application pools can be periodically recycled to avoid unstable states possibly leading to application crashes, hangs, or memory leaks.

STIG	Date
Microsoft IIS 10.0 Site Security Technical Implementation Guide	2020-06-08

Details

Check Text ( C-99125r1_chk )
Note: If the IIS Application Pool is hosting Microsoft SharePoint, this is Not Applicable. If this IIS 10.0 installation is supporting Microsoft Exchange, and not otherwise hosting any content, this requirement is Not Applicable. Open the IIS 10.0 Manager. Perform the following for each Application Pool: Click "Application Pools". Highlight an Application Pool and click "Advanced Settings" in the "Action" Pane. Scroll down to the "Recycling" section and expand the "Generate Recycle Event Log Entry" section. Verify both the "Regular time interval" and "Specific time" options are set to "True". If both the "Regular time interval" and "Specific time" options are not set to "True", this is a finding.

Check Text ( C-99125r1_chk )

Note: If the IIS Application Pool is hosting Microsoft SharePoint, this is Not Applicable.

If this IIS 10.0 installation is supporting Microsoft Exchange, and not otherwise hosting any content, this requirement is Not Applicable.

Open the IIS 10.0 Manager.

Perform the following for each Application Pool:

Click "Application Pools".

Highlight an Application Pool and click "Advanced Settings" in the "Action" Pane.

Scroll down to the "Recycling" section and expand the "Generate Recycle Event Log Entry" section.

Verify both the "Regular time interval" and "Specific time" options are set to "True".

If both the "Regular time interval" and "Specific time" options are not set to "True", this is a finding.

Fix Text (F-105957r1_fix)
Open the IIS 10.0 Manager. Click "Application Pools". Perform the following for each Application Pool: Highlight an Application Pool and click "Advanced Settings" in the "Action" Pane. Scroll down to the "Recycling" section and expand the "Generate Recycle Event Log Entry" section. Set both the "Regular time interval" and "Specific time" options to "True".