Windows Defender Firewall: Allow authenticated IPsec bypass: registry value BypassFirewallComputerHKLM\SOFTWARE\Policies\Microsoft\Windows\IPSec\ICFv4

Policy ID: WF_AuthenticatedBypass_Name
Scope: Computer Configuration
Supported on: At least Windows XP Professional with SP2
Source: Administrative Templates (.admx) for Windows 11 2026 Update (26H2) (version 1.0)
Category: Network › Network Connections › Windows Defender Firewall

Registry

BypassFirewall

REG_SZComputer

HKLM\SOFTWARE\Policies\Microsoft\Windows\IPSec\ICFv4 Current key

Enabled value: Depends on the option value
Element: Define IPsec peers to be exempted from firewall policy:
Value type: REG_SZ
Required: true

Apply with .reg · CMD · PowerShell

.reg

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\IPSec\ICFv4]

; Value names and types follow the ADMX. Replace <enter value> below with your own data
"BypassFirewall"="<enter value>"

CMD

:: Value names and types follow the ADMX. Replace <enter value> below with your own data

reg add "HKLM\SOFTWARE\Policies\Microsoft\Windows\IPSec\ICFv4" /v "BypassFirewall" /t REG_SZ /d "<enter value>" /f

PowerShell

# Value names and types follow the ADMX. Replace <enter value> below with your own data

New-Item -Path 'HKLM:\SOFTWARE\Policies\Microsoft\Windows\IPSec\ICFv4' -Force | Out-Null
New-ItemProperty -Path 'HKLM:\SOFTWARE\Policies\Microsoft\Windows\IPSec\ICFv4' -Name 'BypassFirewall' -PropertyType String -Value '<enter value>' -Force | Out-Null