Exchange must use encryption for RPC client access.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-259645 | EX19-MB-000006 | SV-259645r960759_rule | CCI-000068 | medium |
| Description | ||||
| This setting controls whether client machines are forced to use secure channels to communicate with the server. If this feature is enabled, clients will only be able to communicate with the server over secure communication channels. Failure to require secure connections to the client access server increases the potential for unintended eavesdropping or data loss. | ||||
| STIG | Date | |||
| Microsoft Exchange 2019 Mailbox Server Security Technical Implementation Guide | 2025-05-14 | |||
Details
Check Text (C-259645r960759_chk)
Open the Exchange Management Shell and enter the following command:
Get-RpcClientAccess | Select-Object -Property Server, Name, EncryptionRequired
If the value of "EncryptionRequired" is not set to "True", this is a finding.
Note: This is configured as "True" by default.
Fix Text (F-63292r942248_fix)
Open the Exchange Management Shell and enter the following command:
Set-RpcClientAccess -Server <ServerName> -EncryptionRequired $true