当KMS 主机无法激活客户端软件时，会显示 批量许可激活错误代码^{(Activation Error Code)} 0xC004F042 。完整的错误消息指出：软件保护服务确定无法使用指定的密钥管理服务 (KMS)，错误 0xC004F042^{(The Software Protection Service determined that the specified Key Management Service (KMS) cannot be used, Error 0xC004F042)}。

当KMS 客户端^{(KMS Client)}联系KMS主机进行激活时，会发生这种情况，主机无法激活客户端计算机。

0xC004F042,指定的密钥管理服务^{(Specified Key Management Service)}( KMS ) 无法使用

基于KMS^(KMS)的Windows 10 激活密钥是在没有^(Activation)KMS服务器的情况下无法使用的特定密钥。如果您碰巧有一个在互联网上出售的 KMS 密钥，它可能会工作一段时间，但不会永远有效。也就是说，KMS密钥通常在Enterprise上使用，其中KMS服务器设置为激活作为企业一部分的Windows计算机。如果收到此错误，您需要检查以下内容：

1. 检查您是否使用KMS 密钥来激活客户端，而不是公共KMS密钥，因为它不能与它一起使用。要激活KMS客户端，它必须安装一个特殊的KMS公钥。
2. 其次，确保客户端和KMS服务器的版本匹配。您应该检查是否需要更新Windows 10 KMS 主机^{(KMS Host)}和客户端对应项，以便它们具有相同的版本。如果其中任何一个版本不同，则会导致此错误。
3. ^{(Enable Software Protection Service)}在KMS 服务器上^{(KMS Server)}启用软件保护服务。该服务为Windows下载、安装和执行数字许可证。您可以通过转到 Services Snapin^{(going to Services Snapin)} (Services.msc) 来确保它已启用，找到Software Protection Platform并设置为Automatic ( Delayed Start ) 并运行。
4. 最后，如果上述方法不起作用，请联系 Microsoft 支持解决。^{(contact Microsoft Support)}IT 管理员可以连接到Microsoft并解决与批量许可^(Licensing)相关的任何问题。

我希望这篇文章很有用，并且您能够摆脱与密钥管理服务^{(Key Management Service)}( KMS ) 相关的错误 0xC004F042。

0xC004F042 - Specified Key Management Service (KMS) cannot be used

Volume Licensing Activation Error Сode 0xC004F042 shows up when the KMS host cannot activate the client software. The full error message states: The Software Protection Service determined that the specified Key Management Service (KMS) cannot be used, Error 0xC004F042.

This happens when a KMS Client contacts the KMS host for activation, the host cannot activate the client computer.

0xC004F042, Specified Key Management Service (KMS) cannot be used

KMS based Windows 10 Activation keys are particular keys that cannot be used without a KMS server. If you happened to have a KMS key that was sold on the internet, while it may work for a while, but not forever.  That said, KMS keys are usually used on Enterprise, where the KMS server is set up to activate the Windows computer, which is part of the enterprise. Here the are things you need to check if you receive this error:

1. Check if you are using a KMS key to activate a client and not public KMS key as it will not work with it. To activate a KMS client, it must have a special KMS public key installed.
2. Secondly, make sure the version of the client and the KMS server is matched. You should check if you need to update the Windows 10 KMS Host and the client counterpart, so they have the same version. If either of them has a different version, it will result in this error.
3. Enable Software Protection Service on the KMS Server. This service makes download, install, and enforces digital licenses for Windows.  You can make sure it is enabled by going to Services Snapin (Services.msc),  locate the Software Protection Platform, and set to Automatic (Delayed Start) and running.
4. Lastly, contact Microsoft Support to resolve if the above methods don’t work. The IT admin can connect to Microsoft and resolve anything which is related to Volume Licensing.

I hope the post was useful, and you were able to get rid of the error 0xC004F042 related to Key Management Service (KMS).

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