This is how to enable it.
To enable the shutdown button on a standalone Windows Server 2003 based computer, follow these steps:
- Go to Start -> Run
- Type in “gpedit.msc” and click OK
- Expand Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options
- On the right panel, double click "Shutdown: Allow system to be shut down without having to log on"
- Select Enable and click OK
- Exit group policy editor and restart the server
Login to your domain controller which the group policy is defined.
- Go to Start -> Administrative Tools -> Active Directory Users and Computers.
- Right click on your domain and click Properties.
- Click Group Policy tab.
- Click on your Default Domain Policy and then click Edit.
- Expand User Configuration -> Administrative Templates -> Start Menu and Taskbar.
- Double click on the “Remove and prevent access to the Shut down command.”
- Click Disable then click OK.
You can use the gpupdate command to refresh the group policy immediately.