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Set up KDNET network kernel debugging automatically

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Debugging Tools for Windows, supports kernel debugging over a network. This article describes how to set up network debugging automatically by using the kdnet.exe setup tool.

The computer that runs the debugger is called the host computer, and the computer being debugged is called the target computer. The host computer must be running Windows 7 or later, and the target computer must be running Windows 8 or later.

Determine the IP address of the host computer

  1. Confirm that the target and host PCs are connected to a network hub or switch using an appropriate network cable.

  2. On the host computer, open a command prompt and enter IPConfig to display the IP configuration.

  3. In the command output, locate the IPv4 address of the Ethernet adapter.

...

Ethernet adapter Ethernet:
...

IPv4 Address. . . . . . . . . . . : <YourHostIPAddress>
...

Alternatively, use Settings, Network & internet, Ethernet to gather IPv4 address information.

  1. Make a note of the IPv4 address of the network adapter that you intend to use for debugging.

Set up the host and target computers

Use the kdnet.exe utility to automatically configure the debugger settings on the target PC by following these steps.

  1. Confirm that the Windows Debugging Tools are installed on the host system. For information on downloading and installing the debugger tools, see Debugging Tools for Windows.

  2. Locate the kdnet.exe and VerifiedNICList.xml files. By default, the files are located in the following location:

    C:\Program Files (x86)\Windows Kits\10\Debuggers\x64

    These directions assume that both PCs are running a 64-bit version of Windows on both the target and host. If that's not the case, the best approach is to run the same "bitness" of tools on the host that the target is running. For example, if the target is running 32-bit Windows, run a 32 version of the debugger on the host. For more information, see Choosing the 32-bit or 64-bit Debugging Tools.

  3. On the host computer, copy the two files to a network share or thumb drive so that they're available on the target computer.

  4. On the target computer, create a C:\KDNET directory and copy the kdnet.exe and VerifiedNICList.xml files to that directory.

    Important

    Before using kdnet.exe to change boot information, you may need to temporarily suspend Windows security features such as BitLocker and Secure Boot on the test PC. Re-enable these security features when testing is complete and appropriately manage the test PC when the security features are disabled.

  5. On the target computer, open a command prompt as an administrator. Enter this command to verify that the target computer has a supported network adapter:

    C:\KDNET>kdnet.exe
Network debugging is supported on the following NICs:
busparams=1.0.0, Broadcom NetXtreme Gigabit Ethernet, Plugged in.  
This Microsoft hypervisor supports using KDNET in guest VMs.

  6. When the output from kdnet.exe indicates that the network adapter on the target is supported, you can proceed.

  7. Enter the following command to set the IP address of the host system and generate a unique connection key. Use the IP address or the name of the host system. Pick a unique port address for each target/host pair that you work with, within the recommended range of 50000-50039.

    C:\KDNET>kdnet.exe <HostComputerIPAddress> <YourDebugPort> 

Enabling network debugging on Intel(R) 82577LM Gigabit Network Connection.
Key=2steg4fzbj2sz.23418vzkd4ko3.1g34ou07z4pev.1sp3yo9yz874p

  8. Copy the returned key into a notepad .txt file.

Connect WinDbg to the target for kernel debugging

On the host computer, open WinDbg. On the File menu, select Kernel Debug. In the Kernel Debugging dialog, open the Net tab. Paste in your port number and key saved in the notepad .txt file earlier. Select OK.

You can also start a WinDbg session by opening a command prompt and entering the following command. <YourPort> is the port you selected previously, and <YourKey> is the key that was returned by kdnet.exe previously. Paste the key that you saved to the notepad .txt file earlier.

windbg.exe -k -d net:port=<YourDebugPort>,key=<YourKey>

The optional -d parameter shown in the example, enables early break-in. For more information, see WinDbg command-line options.

If you're prompted to allow WinDbg to access the port through the firewall, allow WinDbg to access the port for all three of the different network types.

Screenshot of Windows Security Alert with selections to allow access to all three network types.

At this point, the debugger waits for the target to reconnect. Text displays in the debugger command window. That text will be similar to the following:

Microsoft (R) Windows Debugger Version 1.0.1908.30002 AMD64
Copyright (c) Microsoft Corporation. All rights reserved.

Using NET for debugging
Opened WinSock 2.0
Waiting to reconnect...

Restart the target PC

Once the debugger is at the "Waiting to reconnect..." stage, reboot the target computer. One way to restart the PC is to use this command from an administrator's command prompt.

shutdown -r -t 0

After the target PC restarts, the debugger should connect automatically.

Troubleshooting tips

Debugging applications must be allowed through a firewall

On the host side, where the debugger is running, all types of networking must be enabled to allow the debugger to communicate with the target through the firewall.

Use the Control Panel to allow access through the firewall.

  1. Open Control Panel > System and Security and select Allow an app through Windows Firewall.

    • (WinDbg) In the list of applications, locate WinDbg engine process (TCP) (all).

    • (WinDbg (Classic)) In the list of applications, locate Windows GUI Symbolic Debugger and Windows Kernel Debugger.

  2. Use the checkboxes to allow those two applications through all three of the different network types.

  3. Scroll down and select OK to save the firewall changes. Restart the debugger.

    Screenshot of Control Panel firewall configuration displaying Windows GUI Symbolic Debugger and Windows Kernel Debugger applications with all three network types enabled.

Use ping to test connectivity

If the debugger times out and doesn't connect, use the ping command on the target PC to verify connectivity.

   C:\>Ping <HostComputerIPAddress>

Choosing a port for network debugging

If the debugger times out and doesn't connect, it might be because the default port number of 50000 is already in use or is blocked.

You can choose any port number from 49152 through 65535. The recommended range is between 50000 and 50039. The port that you choose is opened for exclusive access by the debugger running on the host computer.

The range of port numbers that can be used for network debugging might be limited by your company's network policy. To determine whether your company's policy limits the range of ports that can be used for network debugging, check with your network administrators.

Supported network adapters

If "Network debugging is not supported on any of the NICs in this machine" is displayed when you run kdnet.exe, the network adapter isn't supported.

The host computer can use any network adapter, but the target computer must use a network adapter that's supported by Debugging Tools for Windows. For a list of supported network adapters, see Supported Ethernet NICs for network kernel debugging in Windows 10 and Supported Ethernet NICs for network kernel debugging in Windows 8.1.

Enable other debugging types

Beginning with Windows 10 October 2020 Update (20H2), the following options are supported to enable four types of debugging:

Any combination of debug types can be specified.

If no debug types are specified, then kernel debugging is enabled.

If both hypervisor and kernel debug are enabled, the hypervisor port is set to <YourDebugPort> + 1.

Example usage

Use the - bkw option to enable bootmgr, kernel and winload debugging.

C:\>kdnet.exe <HostComputerIPAddress> <YourDebugPort> -bkw

Enabling network debugging on Intel(R) 82577LM Gigabit Network Connection.
Key=2steg4fzbj2sz.23418vzkd4ko3.1g34ou07z4pev.1sp3yo9yz874p

Summary of debugging type options

KNDET Option Description Equivalent set command
b enables bootmgr debugging bcdedit /bootdebug {bootmgr} on
h enables hypervisor debugging bcdedit /set hypervisordebug on
k enables kernel debugging bcdedit /debug on
w enables winload debugging bcdedit /bootdebug on

Specify bus parameters

If kdnet isn't able to automatically determine the bus parameters for your transport, specify them on the command line with the /busparams option using this syntax.

kdnet.exe /busparams [b.d.f] [host] [port] [-[b][h][k][w]]

b.d.f specifies the bus parameters of the device to configure.

Use Device Manager on the target computer to determine the PCI bus, device, and function numbers for the adapter you want to use for debugging. For bus parameters, enter b.d.f where b, d, and f are the bus number, device number, and function number of the adapter. These values are displayed in Device Manager under Location on the General tab.

For example:

C:\>kdnet.exe /busparams 0.29.7 <HostComputerIPAddress> <YourDebugPort> -bkw

See also