[Fixed] Remote Desktop Connection Issue Error Code 0xC100B002

This post mainly introduces 3 solutions for you to fix Remote Desktop Connection issue error code 0xC100B002. Keep reading if you are troubled by it.


By Ellie / Updated on November 24, 2022

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Meet with RDP error code 0xC100B002

Hello everyone! Please help me. I have a problem with RDP now. After I click on “Subscribe” to start remote access, I’m getting the following error:

We couldn’t authenticate you. Please contact technical support for help.

Error code: 0xC100B002

Timestamp (UTC): 2021-05-18T09:29:27.458ZActivity ID: 00000000-0000-0000-0000-000000000000

What can I do to fix the issue?

How to fix RDP error code 0xC100B002

It is said that the error 0xC100B002 is mainly because of an authentication error and the blockage of the Windows Firewall. To fix RDP error code  0xC100B002, here we list 3 useful solutions to get you out of the trouble.

Solution 1. Disable the Network Level Authentication(NLA)

As we said before, “We couldn’t authenticate you with code 0xC100B002” is related to the authentication error in RDP. We know that NLA was designed to only allow users who have authenticated themselves to the network to connect to your computer. Therefore, it will block the initiation of RDP from those who are not authenticated. We can disable it to fix the issue.

 Step 1. Press Win + R to run the dialog box and then input “sysdm.cpl”. Press the Enter key to open System Properties.


Step 2. Go to the Remote tab and uncheck “Allow connections only from computers running Remote Desktop with Network Level Authentication (recommended)”. And then click on “OK”.

Disabel NLA for Remtoe Desktop

Solution 2. Change Firewall Settings

The reason that Windows Firewall may block the remote connection cannot be excluded. So, you can try to change the Firewall settings.

 Step 1. Press Win + R and then input “control panel” and hit “OK” to open Control Panel.

Control Panel

Step 2. Navigation: "Control Panel" > "System and Security" > "Windows Defender Firewall".

Defender Firewall

Step 3. Click “Advanced settings” on the left pane.

Advanced Settings

Step 4. Click “Inbound Rules”. Scroll down and find Remote Desktop - User Mode (TCP-In), and then check whether the rule is enabled. If not, right-click it and then choose Enable Rule.

User Mode TCP in

 Solution 3. Add a Registry key

When troubleshooting PC problems, it may be necessary to add a new key-value to the Windows registry. This part will show the concrete steps to add a Registry key for preventing the authentication.

Step 1. Press Win + R and then enter “regedit”, hit “OK”.


Step 2. Navigation:

HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Zones (If you didn’t find Zones, you can add a key under “Internet Settings”.)

Step 2. Right-click on the policy “Zones”, and then click on key, name it as 3.

Add New Key

Step 3. In policy “3”, right-click the blank and then click on “New”, “DWORD Value (32 bit)”. 

DWRD Value

Step 4. Name the new DWORD as “1804”. Double-click on it and then click on “Decimal”, change the value data to 0. Click on “OK”.

Value Data

Step 5. Right-click on “Zones” again and then add registry key “2” as the step 2.


Step 6. Under registry key “2”, right-click on the blank and then choose “New” “DWORD (32 bit) Value . Name it as “1A00”. Tick “Hexadecimal” and then change the value data to 10000. Click on “OK”.

Value Data

Get a free & easy alternative to RDP

Do you gain clarity on how to fix the Remote Desktop Connection issue error code 0xC100B002 by using the above solutions? If it has been worked out, it’s fairly great. But if it’s not, here we strongly suggest you get a free & easy alternative to RDP--- AnyViewer.

AnyViewer is a professional remote access software armed with easy operation, fast connection speed and fewer limitations. There are many methods to connect, especially you can realize remote access with one click, which provides huge convenience for unattended access. Get AnyViewer and let’s try together!

Download Freeware Win 11/10/8.1/8/7
Secure Download

Step 1. Install AnyViewer. Sign up for the AnyViewer account and then log in to this account on the two PCs. Once logged in, the PC will be assigned to the account automatically. 

Log in to AnyViewer

Step 2. On the client computer, go to "Device", locate and click the PC that you need to control. And then click "One-click control" to achieve a remote connection with one click. 


☞Important: If you need to give support to your friends or families without signing the AnyViewer account, you can go to the “Connect” tab to realize a remote connection by inputting the device ID of the remote PC and then realize remote connections by sending a request control.

Send a Control Request to Your Partner


3 solutions are shown above aiming to help you work out the Remote Desktop Connection issue error 0xC100B002. Of course, if all those ways can’t help you or you don’t want to take too much time to fix it, you can try AnyViewer, which is definitely reliable.