Enforce Proxy Server settings on Windows 8 and IE 10 via Group Policy

As Internet Explorer Maintenance is removed, old way of enforce Proxy server setting on Windows XP/7 did not work anymore.  Someone may suggest to use
To have the same effect, we have to use Group Policy Prefernece and create custom registry entries.

1. The GPO must be edited in Windows 8 (with RSAT installed) or Windows Server 2012, so that GPP is available.
2. Open Group Policy Management Console (GPMC) by Run – gpmc.msc
3. Create/Edit GPO under Group Policy Management Console (GPMC).  Group Policy Management Editor (GPME) will be opened.
   
   
   
   
4. In GPME, go to User Configuration – Preferences – Windows Settings – Registry
5. Right click “Registry”, select New – Registry Item
   
6. Create a new key to “Enable Proxy”
   In Hive, select HKEY_CURRENT_USER. 
   In Key Path, enter “Software\Microsoft\Windows\CurrentVersion\Internet Settings”
   In Value name, enter “ProxyEnable”
   In Value type, enter “REG_DWORD”
   In Value data, enter 1.
   Then, press OK to save
   
7. Repeat step 4 to create another key for the proxy server address
   Enter the below value
In Hive, select HKEY_CURRENT_USER. 
In Key Path, enter “Software\Microsoft\Windows\CurrentVersion\Internet Settings”
In Value name, enter “ProxyServer”
In Value type, enter “REG_SZ”
In Value data, enter your proxy server address, such as “192.168.1.1:3128” .
Then, press OK to save
8. You should see two new registry entries created as below.
   
9. Last but not lease, you may want to prevent user from change the value. Enable “Prevent changing proxy settings”
   

Alternatively, you can use “Internet Settings” under GPP

1. (Most important) Before editing, your registry must have relvant registry entries created.  First, you must manually enable proxy and enter proxy server address in your IE setting.  It is because ProxyServer key is not available in default.  By enter the proxy server address in your IE setting, you create the registry key.
   
2. Use Windows 8 with RSAT or Windows Server 2012 and open GPME
3. Under User Configuration – Preference – Control Panel Settings – Internet Settings, right click Internet Settings, select New – Internet Explorer 10
   
4. Enter “Connections” tab.  Click “LAN settings”
   
5. Check “User a proxy server”.  Select “Address:”.  Then press F6 to turn the setting from Red to Green.  Then enter your proxy server address.
   
   
   
6. Press OK all the way to save your setting.
7. Login to your target PC.  Test if it works.  This is tested in a domain with Windows Server 2012 and Windows 8 + IE 10.