Windows Server 2019 must not have the Peer Name Resolution Protocol installed.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-205679	SRG-OS-000095-GPOS-00049	WN19-00-000340	SV-205679r958478_rule	2025-02-25	3

Description
Unnecessary services increase the attack surface of a system. Some of these services may not support required levels of authentication or encryption or may provide unauthorized access to the system.

ℹ️ Check
Open "PowerShell". Enter "Get-WindowsFeature \| Where Name -eq PNRP". If "Installed State" is "Installed", this is a finding. An Installed State of "Available" or "Removed" is not a finding.

✔️ Fix
Uninstall the "Peer Name Resolution Protocol" feature. Start "Server Manager". Select the server with the feature. Scroll down to "ROLES AND FEATURES" in the right pane. Select "Remove Roles and Features" from the drop-down "TASKS" list. Select the appropriate server on the "Server Selection" page and click "Next". Deselect "Peer Name Resolution Protocol" on the "Features" page. Click "Next" and "Remove" as prompted.

✔️ Fix

Uninstall the "Peer Name Resolution Protocol" feature. Start "Server Manager". Select the server with the feature. Scroll down to "ROLES AND FEATURES" in the right pane. Select "Remove Roles and Features" from the drop-down "TASKS" list. Select the appropriate server on the "Server Selection" page and click "Next". Deselect "Peer Name Resolution Protocol" on the "Features" page. Click "Next" and "Remove" as prompted.