The system will be configured to limit how often keep-alive packets are sent.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-4113	3.097	SV-32357r1_rule		Low

Description
Controls how often TCP sends a keep-alive packet in attempting to verify that an idle connection is still intact.

STIG	Date
Windows Server 2008 R2 Member Server Security Technical Implementation Guide	2017-06-09

Details

Check Text ( C-32838r1_chk )
Analyze the system using the Security Configuration and Analysis snap-in. Expand the Security Configuration and Analysis tree view. Navigate to Local Policies -> Security Options. If the value for “MSS: (KeepAliveTime) How often keep-alive packets are sent in milliseconds” is not set to “300000 or 5 minutes (recommended)” or less, then this is a finding. The policy referenced configures the following registry value: Registry Hive: HKEY_LOCAL_MACHINE Subkey: \System\CurrentControlSet\Services\Tcpip\Parameters\ Value Name: KeepAliveTime Value Type: REG_DWORD Value: 300000

Check Text ( C-32838r1_chk )

Analyze the system using the Security Configuration and Analysis snap-in.
Expand the Security Configuration and Analysis tree view.
Navigate to Local Policies -> Security Options.

If the value for “MSS: (KeepAliveTime) How often keep-alive packets are sent in milliseconds” is not set to “300000 or 5 minutes (recommended)” or less, then this is a finding.

The policy referenced configures the following registry value:

Registry Hive: HKEY_LOCAL_MACHINE
Subkey: \System\CurrentControlSet\Services\Tcpip\Parameters\

Value Name: KeepAliveTime

Value Type: REG_DWORD
Value: 300000

Fix Text (F-28004r1_fix)
Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> “MSS: (KeepAliveTime) How often keep-alive packets are sent in milliseconds” to “300000 or 5 minutes (recommended)” or less.