Diagnostic Policy Service Cannot Start. Access is Denied – Error 5 Fix

Diagnostic Policy Service(DPS) helps in troubleshooting issues with windows components within Windows Operating System. Many users have reported seeing the below error –

Diagnostic Policy Service Cannot Start.Acess is Denied – Error 5

This error is mostly seen when you are troubleshooting your network or internet connection. When you see the error like above, it means that the DPS has some issues and without DPS one will not be able to troubleshoot and fix system issues in Windows OS. In this article, let us discover different ways to overcome the above error and get Diagnostic Policy Service to work again. Make sure to try the fixes in the same order as given below.

Fix 1: Add Network and Local service to Admin group

Step 1: In the Run dialog, type cmd and hit Ctrl+Shift+Enter to open Command Prompt with Admin rights.






Step 2: Click on Yes in the User Account Control window.

Step 3: In the command prompt, run the below commands. Make sure to hit Enter key after each command.

net localgroup Administrators /add networkservice
net localgroup Administrators /add localservice



2021 03 24 16h09 25



Step 4: Restart the system


Mostly, this should fix the issue. If not, try the next fix.

Fix 2: Modify the Registry Permissions for DPS

Step 1: Open run window holding Windows+r

Step 2: Enter regedit and press Enter


Regedit In Run



Step 3: If you see the User Account Control window popping up, click on the Yes button

NOTE: Registry editing can have an adverse effect on the system even with the slightest mistake. It is advised to take the backup of the registry before proceeding. To take a backup, In the Registry Editor–> Go to File –> Export –> Save your Backup file.


Step 4: In the top bar, copy-paste the following location and hit Enter as shown below







Step 5: In the left-hand side pane, right-click on the Parameters key and choose Permissions.



Parameters rightclick



Step 6: In the Permissions window, click on Add button



Add button



Step 7: Now, click on advanced.


Advanced Min


Step 8: Now, click on find Now.

Step 9: Now , select your username from the list.

Find Now Select User Permission Min


Step 10: Now, click on OK again.


Ok Permission Min



Step 11: Under Permissions for Username section, tick to Allow Full Control.

Step 12: Finally, Click on Apply and then click on the OK button



Parameter Permissions



Step 13: Now, copy-paste the below location in the top bar and press Enter as shown below







Step 12: Right-click on the Config key and choose Permissions





Step 14: Click on the Add button




Step 15: Under the Enter the object names to select, enter the following and press the OK button

NT Service\DPS






Step 16: Under the Group or usernames section, click on DPS

Step 17: Under Permissions for DPS section, tick to Allow Full Control



DPS Full permissions



Step 18: Restart your System

Check if the issue with DPS has been resolved. If not, try the next fix.

Fix 3 – Edit Diagnostic Policy Service property

1 – Press Windows key + R key together to open run.

2 – Now, type Services.msc in it and click OK.

Windows 11 Services.msc


3 – Now, Locate Diagnostic Policy Service and double click on it.

4 – Click on Log On Tab.

5 – Now, select Local System account.

6 – Now, click on OK and Apply.

Log On Local Service Min


Fix 4: Check for Virus or Malware in the System

Sometimes, the viruses and malware in the system can affect the working of the Diagnostic Service Policy.

Step 1: Hold the keys Windows+r and open the Run Window

Step 2: Type ms-settings:windowsdefender and press OK






Step 3: In the settings window, choose Virus & Threat Protection






Step 4: In the window that opens, click on Scan Options



Scan Options



Step 5: Choose Full scan and press on Scan now button



Full Scan




Once the scan finishes, it notifies about any viruses and malware in the system. Take necessary steps to mitigate them.

In case you are still seeing the same error, then try the next fix.

Fix 5: Make Sure DPS is set to Automatic

Step 1: Open Run Dialog (Windows+r)

Step 2: Type services.msc and hit OK





Step 3: In the Services window, locate the Diagnostic Policy Service

Step 4: Make sure the DPS service is running and the Startup type is set to Automatic



DPS service status



NOTE: If the service is not running or the startup type is not Automatic, do the following.

1. Right-click on Diagnostic Policy Service and choose Properties



right-click Properties



2. In the Startup type drop-down, choose Automatic

3. Under the Service Status Choose Start

4. Finally, click on Apply and then OK



DPS Service settings



Check if this fixes the issue. If not try the next fix.

Fix 6: Restore your System

If none of the above fixes work, you can try this fix. If you have created a restore point of the system before the issue was encountered, you can roll back to that restore point.

Refer to How to perform System Restore 


That’s All.

We hope this has been informative. Thank you for Reading. Kindly comment and let us know which of the above fixes worked in your case.