LAN Manager 身份验证级别^{(LAN Manager Authentication Level)}允许您设置网络登录的身份验证协议。可以使用本地组策略编辑器^{(Local Group Policy Editor)}和注册表编辑器^{(Registry Editor)}更改LAN Manager身份验证级别。如果您使用的是Windows 11/10Home版本，则可以使用REGEDIT方法。否则^(Otherwise)，任何一种方法都做同样的工作。

当您将计算机连接到网络打印机或同一网络中的任何其他计算机时，它需要用于网络登录的身份验证协议。它用于在您的主机计算机和网络计算机或任何其他设备之间建立链接。您可以选择六种不同的身份验证级别，它们是：

• 发送 LM 和 NTLM 响应
• 发送 LM^{(Send LM)}和NTLM –如果协商，则使用NTLMv2会话安全性^(NTLMv2)
• 仅发送 NTLM 响应
• 仅发送 NTLMv2 响应
• 仅发送 NTLMv2^{(Send NTLMv2)}响应。拒绝LM^{(Refuse LM)}
• 仅发送 NTLMv2^{(Send NTLMv2)}响应。拒绝 LM^{(Refuse LM)} & NTLM

现在，假设您要连接到网络打印机，但您最终会收到一条错误消息，提示 Windows 无法连接到打印机^{(Windows cannot connect to the printer)}。此时，更改LAN Manager身份验证级别可能会解决问题。

更改 LAN Manager 身份验证级别^{(Change LAN Manager Authentication Level)}

可以使用本地组策略编辑器^{(Local Group Policy Editor)}和注册表编辑器^{(Registry Editor)}更改LAN Manager身份验证级别。如果您使用的是Windows 11/10Home版本，则可以使用REGEDIT方法。否则^(Otherwise)，任何一种方法都做同样的工作。

使用本地组策略编辑器

 在任务栏^(Taskbar)搜索框中搜索 gpedit.msc，然后单击结果以在您的计算机上打开本地组策略编辑器^{(Local Group Policy Editor)}。接下来，沿着这条路走——

Computer Configuration > Windows Settings > Security Settings > Local Policies > Security Options

双击  右侧的网络安全：LAN Manager 身份验证级别^{(Network security: LAN Manager authentication level)}策略，然后从下拉列表中选择发送 LM 和 NTLM - 如果协商，则使用 NTLMv2 会话安全或任何其他必需选项。^{(Send LM & NTLM – use NTLMv2 session security if negotiated)}

单击 确定 ^(OK )按钮以保存更改。

然后，重新启动计算机并检查是否可以使用网络打印机。

使用注册表编辑器

在任务栏^(Taskbar)搜索框中搜索 注册表编辑器 ^{(registry editor )}，单击搜索结果，然后选择 是 ^(Yes )选项以在您的计算机上打开注册表编辑器。^{(Registry Editor)}

然后，沿着这条路走——

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa

在这里，您必须创建一个REG_DWORD值。为此，请右键单击 Lsa 键，选择 New > DWORD (32-bit) Value，并将其命名为 LmCompatibilityLevel。

现在，输入如下所述的值^(Value)数据。

• 发送 LM 和 NTLM 响应：0
• 发送 LM^{(Send LM)}和NTLM –如果协商，使用NTLMv2会话安全：1
• 仅发送 NTLM 响应：2
• 仅发送 NTLMv2 响应：3
• 仅发送 NTLMv2^{(Send NTLMv2)}响应。拒绝LM^{(Refuse LM)}：4
• 仅发送 NTLMv2^{(Send NTLMv2)}响应。拒绝 LM^{(Refuse LM)} & NTLM : 5

为此，双击REG_DWORD值，在框中输入1或任何其他值^(Value)数据，然后单击 确定 ^(OK )按钮。

接下来，重新启动计算机以获取更改。

就是这样！这是您可以在Windows 11/10LAN Manager身份验证级别的方法。

How to change LAN Manager Authentication Level in Windows 11/10

LAN Manager Authentication Level lets you set the authentication protocol for network logons. It is possible to change the LAN Manager authentication level using the Local Group Policy Editor and the Registry Editor. If you are using Windows 11/10 Home version, you can use the REGEDIT method. Otherwise, either method does the same job.

When you connect your computer to a network printer or any other computer in the same network, it requires an authentication protocol for the network logons. It is there to establish a link between your host computer and the network computer or any other device. There are six different authentication levels you can choose, and they are:

• Send LM & NTLM responses
• Send LM & NTLM – use NTLMv2 session security if negotiated
• Send NTLM responses only
• Send NTLMv2 responses only
• Send NTLMv2 responses only. Refuse LM
• Send NTLMv2 responses only. Refuse LM & NTLM

Now, let’s say you want to connect to a network printer, but you are ending up getting an error message saying Windows cannot connect to the printer. At such a moment, changing the LAN Manager authentication level may solve the issue.

Change LAN Manager Authentication Level

It is possible to change the LAN Manager authentication level using the Local Group Policy Editor and the Registry Editor. If you are using Windows 11/10 Home version, you can use the REGEDIT method. Otherwise, either method does the same job.

Using Local Group Policy Editor

Search for gpedit.msc in the Taskbar search box, and click on the result to open the Local Group Policy Editor on your computer. Next, follow this path-

Computer Configuration > Windows Settings > Security Settings > Local Policies > Security Options

Double-click on the Network security: LAN Manager authentication level policy on your right-hand side and choose the Send LM & NTLM – use NTLMv2 session security if negotiated or any other required option from the drop-down list.

Click on the OK button to save the change.

Then, restart your computer and check if you can use your network printer or not.

Using Registry Editor

Search for registry editor in the Taskbar search box, click on the search result, and select the Yes option to open the Registry Editor on your computer.

Then, follow this path-

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa

Here you have to create a REG_DWORD value. To do so, right-click on the Lsa key, select New > DWORD (32-bit) Value, and name it LmCompatibilityLevel.

Now, enter the Value data as mentioned below.

• Send LM & NTLM responses: 0
• Send LM & NTLM – use NTLMv2 session security if negotiated: 1
• Send NTLM responses only: 2
• Send NTLMv2 responses only: 3
• Send NTLMv2 responses only. Refuse LM: 4
• Send NTLMv2 responses only. Refuse LM & NTLM: 5

For that, double-click on the REG_DWORD value, enter 1 or any other Value data in the box, and click the OK button.

Next, restart your computer to get the change.

That’s it! This is how you can change LAN Manager authentication level in Windows 11/10.

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