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How to Start/Stop
IPSEC Services
Description Services Regedit Back CMD Msconfig
Service name: PolicyAgent
Display name: IPSEC Services

Description:
Manages IP security policy and starts the ISAKMP/Oakley (IKE) and the IP security driver.

Path to executable:
C:\WINDOWS\system32\lsass.exe  
Type services.msc and press Enter
Services.msc:
This method shows you how to Start/Stop IPSEC Services service from Services.msc.
Please perform the following steps:

Please go to Start and choose Run ...
Locate IPSEC Services service observe his current status and open to make changes.
From General tab you can Start/Stop and change the Startup type of IPSEC Services service.

To finish press ok button and close Services window.
Type regedit and press Enter
Regedit:          
This method shows you how to change Startup type of IPSEC Services service from Registry Editor.
Please perform the following steps:

Please go to Start and choose Run ...
Double click on Start and edit the value:

Change Startup type :

Automatic - 2
Manual - 3
Disabled - 4
Automatic (Delayed Start) - 2

Note: When you change to Automatic (Delayed Start) a new key DelayedAutostart is created with value 1.
When you change to Automatic from Automatic (Delayed Start), DelayedAutostart change value to 0.
Please select, right and copy a registry key from below, then right click on command prompt window
, select Paste and press Enter

To Start IPSEC Services service:

net start PolicyAgent

Note: You can’t start a service if Startup type is on Disabled.

To Stop IPSEC Services service:

net stop PolicyAgent

To change Startup type:

Automatic:
REG add "HKLM\SYSTEM\CurrentControlSet\services\PolicyAgent" /v Start /t REG_DWORD /d 2 /f

Manual:
REG add "HKLM\SYSTEM\CurrentControlSet\services\PolicyAgent" /v Start /t REG_DWORD /d 3 /f

Disabled:
REG add "HKLM\SYSTEM\CurrentControlSet\services\PolicyAgent" /v Start /t REG_DWORD /d 4 /f

Automatic (Delayed Start):
REG add "HKLM\SYSTEM\CurrentControlSet\services\PolicyAgent" /v Start /t REG_DWORD /d 2 /f

Note: When you change to Automatic (Delayed Start) a new key DelayedAutostart is created with value 1.
REG add "HKLM\SYSTEM\CurrentControlSet\services\PolicyAgent" /v DelayedAutostart /t REG_DWORD /d 1 /f

When you change to Automatic from Automatic (Delayed Start), DelayedAutostart change value to 0.
REG add "HKLM\SYSTEM\CurrentControlSet\services\PolicyAgent" /v DelayedAutostart /t REG_DWORD /d 0 /f
CMD:          
This method shows you how to Start/Stop and change Startup type of IPSEC Services service from
Command Prompt.
Please perform the following steps:

Please go to Start and choose Run ...
Msconfig:          
This method shows you how to prevent IPSEC Services service from starting with the operating system
using System Configuration (msconfig.exe)
Please perform the following steps:

Please go to Start and choose Run ...
Write msconfig and press Enter
In System Configuration please go to Services tab and locate IPSEC Services service.
Uncheck the box to prevent this service to start and then press OK to finish.  
Any change make in System Configuration will be apply after restart.  
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Microsoft official disclaimer

Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by
using another method. These problems might require that you reinstall the operating system. Microsoft
cannot guarantee that these problems can be solved. Modify the registry at your own risk.

Please navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\PolicyAgent and
locate
Start registry key
Type cmd and press ok