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Exchange must limit the Receive connector timeout.


Finding ID Version Rule ID IA Controls Severity
V-259630 EX19-ED-000159 SV-259630r942204_rule Medium
Email system availability depends in part on best practices 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.
Microsoft Exchange 2019 Edge Server Security Technical Implementation Guide 2024-01-10


Check Text ( C-63369r942202_chk )
Review the Email Domain Security Plan (EDSP), or Organizations applicable documentation.

Determine the connection Timeout value.

Open the Exchange Management Shell and enter the following command:

Get-ReceiveConnector | Select-Object -Property Name, Identity, ConnectionTimeout

For each Receive connector, if the value of "ConnectionTimeout" is not set to "00:05:00", this is a finding.

If "ConnectionTimeout" is set to another value other than "00:05:00" and has signoff and risk acceptance in the EDSP, this is not a finding.
Fix Text (F-63277r942203_fix)
Update the EDSP, or the applicable documentation.

Open the Exchange Management Shell and enter the following command:

Set-ReceiveConnector -Identity <'IdentityName'> -ConnectionTimeout 00:05:00

Note: The value must be in quotes.


The value as identified by the EDSP that has obtained a signoff with risk acceptance.

Repeat the procedures for each Receive connector.