Rule version EX16-MB-002910 · STIG v2 · 2023-12-18
This setting controls whether client machines should be forced to use secure channels to communicate with this virtual directory. If this feature is enabled, clients will only be able to communicate with the directory if they are capable of supporting secure communication with the server.
The use of secure communication prevents eavesdroppers from reading or modifying communications between servers and clients. The network and DMZ STIG identify criteria for OWA and Public Folder configuration in the network, including Common Access Card (CAC)-enabled pre-authentication through an application firewall proxy.
Failure to require secure connections on a website increases the potential for unintended eavesdropping or data loss.
Open a Exchange Management Shell and enter the following command:
Get-OwaVirtualDirectory | select internalurl, externalurl
If the value returned is not https://, this is a finding.
Configure the OWA site to require SSL port 443.