Fix Windows Activation error code 0xc004f074

When you try to upgrade your computer to Windows 10, you receive Windows Activation error 0xC004F074; then the cause could be due to support version mismatch between the KMS client and the KMS host machine.

0xC004F074 – The Key Management Server (KMS) is unavailable

This error also can occur when there may be a time difference between the KMS client and KMS host machine.

Windows Activation error 0xC004F074

Windows Activation error 0xC004F074

If you receive Activation error code 0xc004f074, then first make sure that your Windows copy is fully updated. Having done, follow these suggestions to resolve the issue:

  1. Install the KMS Product Key
  2. Use Activation Troubleshooter
  3. Resync Time.

1] Install the KMS Product Key

You will have to uninstall and then reinstall the product key by running CMD as Administrator.

Now to uninstall the existing key, execute the following command:

slmgr.vbs /upk

To install the KMS Product Key, execute this command:

slmgr.vbs /ipk <The KMS Product Key>

Transfer Windows 10 license to another computer

Once done, you will get a prompt about whether the operation was successful.

To activate the key online, execute this command:

slmgr.vbs /ato

To learn how to activate it using the telephone, execute this command:

slui.exe 4

After activating the KMS key, reboot your computer.

You can then also verify the Activation Status to check if your fix was successful.

2] Use Activation Troubleshooter


The Windows 10 Activation Troubleshooter will help you address most commonly encountered activation issues on Windows devices.

If you cannot activate Windows 10, open Settings > Update & security and click on the Activation button on the left panel. Next, click on the Troubleshoot button.

3] Resync Time

Run the following command to resync the time on the client machine:

w32tm /resync

See if this helps you.

Read more: Troubleshoot KMS Activation on Windows Server.

Posted by on , in Category Windows with Tags
Anand Khanse is the Admin of, a 10-year Microsoft MVP Awardee in Windows (2006-16) & a Windows Insider MVP. Please read the entire post & the comments first, create a System Restore Point before making any changes to your system & be careful about any 3rd-party offers while installing freeware.

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