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Outbound Connection Timeout must be 10 or less.


Overview

Finding ID Version Rule ID IA Controls Severity
V-33646 Exch-2-769 SV-44066r1_rule ECSC-1 Low
Description
Email system availability depends in part on best practices strategies for setting tuning configurations. This configuration controls the number of idle minutes before the connection is dropped. It works in conjunction with the Maximum Outbound Connections Count setting. Connections, once established, may incur delays in message transfer. The default of 10 minutes is a reasonable window in which to resume activities without maintaining idle connections for excessive intervals. If the timeout period is too long, idle connections may be maintained for unnecessarily long time periods, preventing new connections from being established. Sluggish connectivity increases the risk of lost data. A value of 10 or less is optimal.
STIG Date
MS Exchange 2010 Edge Transport Server STIG 2019-03-21

Details

Check Text ( C-41756r1_chk )
Obtain the Email Domain Security Plan (EDSP) and locate the 'Connection Timeout' value.

Open the Exchange Management Shell and enter the following command:

Get-SendConnector | Select Name, Identity, ConnectionInactivityTimeOut

If the value of 'ConnectionInactivityTimeOut' is set to 00:10:00, this is not a finding.

If 'ConnectionInactivityTimeOut' is set to other than 00:10:00, and has signoff and risk acceptance in the EDSP, this is not a finding.
Fix Text (F-37539r1_fix)
Open the Exchange Management Shell and enter the following command:

Set-ReceiveConnector -Identity <'ReceiveConnector'> -ConnectionInactivityTimeOut
00:10:00 or other value as identified by the EDSP.