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Fatal Error Solutions

A duplicate IP address was assigned to this...

STOP: 0x000000BC


Only a single IP address is allowed for this computer, but a duplicate IP address was assigned to this machine while attempting to boot from the network.

Some older versions of Windows may show the description as "NETWORK_BOOT_DUPLICATE_ADDRESS".

This is a fatal Windows error, typically called a Stop message, Bug Check, or more commonly the Blue Screen of Death (BSoD). The system is in a forced reboot state. Any unsaved work is likely lost.

  Sample Screen  

A problem has been detected and Windows has been shut down to prevent damage to your computer.

A duplicate IP address was assigned to this machine while attempting to
boot from the network.

If this is the first time you've seen this Stop error screen, restart your computer. If this screen appears again, follow these steps:

Check to make sure any new hardware or software is properly installed. If this is a new installation, ask your hardware or software manufacturer for any Windows updates you might need.

If problems continue, disable or remove any newly installed hardware or software. Disable BIOS memory options such as caching or shadowing. If you need to use Safe Mode to remove or disable components, restart your computer, press F8 to select Advanced Startup Options, and then select Safe Mode.

Technical Information:

*** STOP: 0x000000BC

Beginning dump of physical memory
Physical memory dump complete.

Contact your system administrator or technical support group for further

Text may appear differently depending on where the error occurs.
Additional technical information (hex values) specific to a machine are not shown.
  Key Facts  
Full Title
  A duplicate IP address was assigned to this machine while attempting to
boot from the network. 

Stop Code


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  2000, XP, Vista, 2008, 7, 8

  Microsoft Corporation
  Solutions and Fixes  
Restore From Backup or Image
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If you know the hardware is good and you have a current backup or image of the drive, you could reformat the hard drive and start over. This is often the last resort when all else fails, as you will often lose your latest settings and important data. If you have a spare drive, it may be worth it to install the drive in place of the first drive and do a fresh install of Windows. This will help confirm if this is a hardware or software issue (unless the original system drive is the source of the problem).
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  FaultWire Staff
Posted: 5-Oct-2008

Also see our list of common Fatal Error Solutions.

  Forum Help  
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Check out what others say about this issue and review or add your own comments and solutions!

Go to Forums on topic.
  Technical Details  
  technical details

A duplicate IP address was assigned to this machine while booting off a network. When TCP/IP sent out an ARP (Address Resolution Protocol) for its IP address, it got a response from another machine indicating a duplicate IP address.

After the Stop code will be 4 hex values: {Parameter 1, Parameter 2, Parameter 3, Parameter 4}.

Parameter 1 specifies the IP address, shown as a DWORD. An address of the form will appear as 0xDDCCBBAA.

Parameter 4 = 0 indicates a Ethernet connection and the values in Parameters 2 & 3 create the MAC address:

Parameter 2 specified as the high MAC address 0xAABBCCDD using the form aa-bb-cc-dd-ee-ff.

Parameter 3 specified as the low MAC address 0xEEFF0000 using the form aa-bb-cc-dd-ee-ff.

Parameter 4 not zero, is the hardware address of the other machine.

Parameter 2 specifies the hardware address of the other machine.

Parameter 3 specifies the hardware address of the other machine.

  Vendor Summary  
  Microsoft Corporation (more info...)

Microsoft Corporation Logo



    While BSoD fatal stop errors are identified by Microsoft Windows, they are often caused by non-Microsoft applications, drivers and hardware issues.  
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