Killer Legacy (Killer Xeno Pro, Killer 2100, Killer E2100)

The Killer 2100/Xeno Pro employed a LSP (Layered Service Provider). While this is beneficial in allowing the Killer software to enable offload and lower latency, it has been found to be incompatable with some games, thus creating instability or crashes. If you are experiencing any crashes while playing games, it is recommended that you 'unmap' the LSP. Prioritization and other Killer freatures will continue to function.

Note: The Killer Network Manager application will warn you on each startup that the LSP is unmapped. You should choose 'no' to remapping. There is not currently a workaround to prevent the Network Manager from throwing this message.

This is done with the following steps:

Start an administrative command prompt and type these commands:

  •      cd "\Program Files\Bigfoot Networks\Killer Network Manager"

     killertool -lsp-unmap

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Some games are not compatible with the Killer Xeno Pro/Killer 2100's offload solution. If you are having issues connecting to a particular game, there is a workaround to tell the Killer software to not bypass the Windows network stack for that particular process/game. The game will still get the highest priority with this method.The solution is to add the particular processes (such as hl2.exe for TF2, or GTA5.exe), to the gamedetect file.

First, ensure you know the full exe name of the game/process with the issue.

Then, go to C:\ProgramData\Bigfoot Networks . This folder is hidden by default. If you cannot find this folder, you will either need to turn off hidden files and folders, or type the path in full into windows explorer.

Once in the Bigfoot Networks ProgramData folder, right-click the GameDetect.xml file and click "Edit".

From here, you'll see a section at the top that looks like this:


All you need to do is add a new line right under the mozy stuff and replace it with your application .exe. So, it should look something like this:


Then save the file and exit, then you'll need to reboot. You should then be able to connect to your game.

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This behavior is by design. The USB port on the Killer NIC is only accessible from FNApps that run on the card itself. The only physical connection accessible from Windows is the RJ-45 network port.

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A software update is needed. The latest Legacy drivers can be found here:


A successful update will remedy connectivity errors with iTunes and other Apple software.

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This message is usually brought on by one of two things: either security software is blocking the installation of the LSPs, or a third-party program is installing its own LSPs, which prevent the Killer’s from installing.

First, if you are running antivirus/antimalware, please try reinstalling the Killer drivers with your security software disabled. This may fix your issue.

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This error can be corrected by installing Flash within Internet Explorer, which is where the Killer app performs its check. You do not need to use IE as your browser going forward, but simply open IE, install Flash, and it should resolve the issue.

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After opening QQ Chat, from the “Applications” tab of the Killer Network Manager, click on the QQ Chat process. Switch the priority from 1 to either 2, 3, or 4. This will allow the application to connect as normal.

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If you are running a Killer e2200 Ethernet Adapter, or any Killer Wireless-N adapter, please follow these steps to remedy this problem:

  1. Go to
  2. Download and save the latest driver version listed under the e2200/Wireless-N heading
  3. Remove your current Killer software via Control Panel > Uninstall a Program (this will kill connectivity, so please ensure the new driver has been saved to disk first)
  4. Reboot
  5. Install the new driver. This should eliminate any 1603 errors.

If you are running a Killer Xeno Pro or Killer 2100/e2100:
First, download and save this cleaner:

For 32 bit Windows
For 64 bit Windows

Then download and save the latest Killer Xeno Pro/2100/e2100 software from:

Then, uninstall your current Killer Network Manager software via Control Panel > Programs and Features. Reboot.

Then, run the cleaner. Reboot once more.

Make sure to disable any antivirus or antimalware software, and reinstall the Killer drivers.

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PROBLEM: Upon installation of the 6.0 software suite, you receive this error:

*Bigfoot Networks Killer Network Manager Error

*Error 1721.There is a problem with this Windows Installer package. A program required for this install to complete could not be run. Contact your support personnel or package vendor. Action: RegisterLSP64, location: C:Program Files\Bigfoot Networks\Killer Network Manager\KillerTool.exe, command: -lsp-map

SOLUTION: Install Microsoft .NET Framework 3.5 Service Pack 1. This update is also part of the Windows Automatic Update.

The direct download for this pack can be found here.

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Please refer to our Driver Downloads page for Legacy product download information:

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