From Microsoft Exchange 2016 Mailbox Server Security Technical Implementation Guide
Part of SRG-APP-000295
Associated with: CCI-002361
Email system availability depends in part on best practice strategies for setting tuning. This configuration controls the number of idle minutes before the connection is dropped. It works in conjunction with the Maximum Inbound Connections Count setting.
Review the Email Domain Security Plan (EDSP). Determine the Connection Timeout value. Open the Exchange Management Shell and enter the following command: Get-ReceiveConnector | Select Name, Identity, ConnectionTimeout For each Receive connector, if the value of "ConnectionTimeout" is not set to "00:10:00", this is a finding. or If "ConnectionTimeout" is set to other than "00:10:00" and has signoff and risk acceptance in the EDSP, this is not a finding.
Update the EDSP to specify the Connection Timeout value.
Open the Exchange Management Shell and enter the following command:
Set-ReceiveConnector -Identity <'IdentityName'> -ConnectionTimeout 00:10:00
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