The amount of virtual memory an application pool uses must be set.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-13706	WA000-WI6024 IIS7	SV-46347r3_rule		Medium

Description
IIS application pools can be periodically recycled to avoid unstable states possibly leading to application crashes, hangs, or memory leaks. By default, application pool recycling is overlapped, which means the worker process to be shut down is kept running until after a new worker process is started. After a new worker process starts, new requests are passed to it. The old worker process shuts down after it finishes processing its existing requests, or after a configured time-out, whichever comes first. This way of recycling ensures uninterrupted service to clients.

Description

IIS application pools can be periodically recycled to avoid unstable states possibly leading to application crashes, hangs, or memory leaks. By default, application pool recycling is overlapped, which means the worker process to be shut down is kept running until after a new worker process is started. After a new worker process starts, new requests are passed to it. The old worker process shuts down after it finishes processing its existing requests, or after a configured time-out, whichever comes first. This way of recycling ensures uninterrupted service to clients.

STIG	Date
IIS 7.0 WEB SITE STIG	2017-12-21

Details

Check Text ( C-32855r6_chk )
Note: Recycling Application Pools can create an unstable environment in a 64-bit Sharepoint environment. If operational issues arise, with supporting documentation from the ISSO this check can be downgraded to a Cat III. 1. Open the IIS Manager. 2. Click on Application Pools. 3. Highlight an Application Pool and click Advanced Settings in the Action Pane. 4. In the advanced settings dialog box scroll down to the recycling section and ensure the value for Virtual Memory Limit is not set to 0. If it is, this is a finding.

Check Text ( C-32855r6_chk )

Note: Recycling Application Pools can create an unstable environment in a 64-bit Sharepoint environment. If operational issues arise, with supporting documentation from the ISSO this check can be downgraded to a Cat III.

1. Open the IIS Manager.
2. Click on Application Pools.
3. Highlight an Application Pool and click Advanced Settings in the Action Pane.
4. In the advanced settings dialog box scroll down to the recycling section and ensure the value for Virtual Memory Limit is not set to 0. If it is, this is a finding.

Fix Text (F-28990r1_fix)
1. Open the IIS Manager. 2. Click the Application Pools. 3. Highlight an Application Pool and click Advanced Settings in the Action Pane. 4. In the advanced settings dialog box scroll down to the recycling section and set the value for Virtual Memory Limit to a value other than 0.