Windows on Cloud

Last change on 2024-06-05 • Created on 2020-01-20 • ID: CL-3847F

Is it possible to install Windows with my own license?

Please refer to the Microsoft license conditions of your license to determine if it is eligble for use on a cloud server. The installation must be done manually. For this, you can use the CD/DVD images.

Please also note the following regarding the architecture type of the server:

Architecture type Server plans Installation
x86 CX, CPX, CCX If you have the necessary license, follow the steps explained in the "Example instructions".
Arm64 CAX Hetzner Cloud servers with Arm64 archtiecture do not support Windows Server.

Why is the time on my server not correct?

All Cloud server hosts use UTC as the system time, which is why Windows often has a problem with the system time within the vServers.

To fix this problem permanently, it is necessary to create an entry in the Windows registry, which tells Windows that the hardware clock (RTC - emulated by the host system) is not the local time zone, but UTC.

The following command must be entered in the command prompt (cmd.exe):

 reg add "HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\TimeZoneInformation" /v RealTimeIsUniversal /d 1 /t REG_DWORD /f

It is then necessary to restart Windows.

After the restart the following command can be used to check if the setting was successfully applied:

 reg query "HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\TimeZoneInformation" /s

If the changes were successfully applied, a line with the wording RealTimeIsUniversal and the value 0x1 should be shown.

IPv6 configuration

By default, Windows uses temporary addresses for IPv6 connections. This can prevent you that you can use your /64 network. To be able to use the IPv6 network, you should disable the use of temporary addresses by default.

Windows Server 2012, 2012R2, 2016

Run the following commands in a powershell with administration rights:

Set-NetIPv6Protocol -RandomizeIdentifiers Disabled
Set-NetIPv6Protocol -UseTemporaryAddresses Disabled

Windows 2008R2

Run the following commands in a cmd.exe with administration rights:

netsh interface ipv6 set global randomizeidentifiers=disabled store=active
netsh interface ipv6 set global randomizeidentifiers=disabled store=persistent
netsh interface ipv6 set privacy state=disabled store=active
netsh interface ipv6 set privacy state=disabled store=persistent

What should be kept in mind during a manual installation?

To install Windows, it is necessary that the VirtIO drivers are installed. The driver can, for example, be mounted and installed via an ISO image (virtio-win-latest[…].iso).

The folders of the necessary drivers are named as follows:

  • Balloon
  • NetKVM
  • vioscsi

Each of them will usually have a folder with the architecture (amd64). This must be selected to install the drivers.

Example instructions

Mount Image

To get to the selection of the available CD/DVD images, you must select your server in the Cloud Console and switch to the "ISO IMAGES" tab. You must then select the ISO and mount it with a click on „MOUNT“


Now you can start your server and perform the installation normally up to the point where the installation asks for the installation type. Please select the custom installation and continue with the installation. If you get a blue screen, please switch your server off and on with the ON/OFF switch.


Install driver

Now proceed up to the point where the installation searches for the drive. At this point, you have to switch the image to the latest available VirtIO driver CD.


Subsequently, the below mentioned drivers need to be installed.


picture6 picture7

Each of the folders will usually have a subfolder with the architecture (amd64). This must be selected to install the drivers.


After installing the driver you need to switch back to the previously used Windows Image.


Now, you have to delete and format the drives. Finally, you can resume the installation as normal.

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