Windows 10 must not have portproxy enabled or in use.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-257593 | WN10-00-000395 | SV-257593r991589_rule | CCI-000381 | medium |
| Description | ||||
| Having portproxy enabled or configured in Windows 10 could allow a man-in-the-middle attack. | ||||
| STIG | Date | |||
| Microsoft Windows 10 Security Technical Implementation Guide | 2025-02-25 | |||
Details
Check Text (C-257593r991589_chk)
Check the registry key for existence of proxied ports:
HKLM\SYSTEM\CurrentControlSet\Services\PortProxy\.
If the key contains v4tov4\tcp\ or is populated v4tov4\tcp\, this is a finding.
Run "netsh interface portproxy show all".
If the command displays any results, this is a finding.
Fix Text (F-61258r922060_fix)
Contact the Administrator to run "netsh interface portproxy delete" with elevation. Remove any enabled portproxies that may be configured.