error 0x8004100a appears while adding host to NLB cluster

I am setting up a Microsoft NLB cluster on Windows Enterprise 2003. When adding host to cluster, I encounter the following error:
"Could not read configuration of interface "{xxx}": error 0x8004100a".

Do you know the cause of this error? Does any one have suggestion to solve this? Thank you very much.
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dinhchung82Asked:
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Krzysztof PytkoConnect With a Mentor Senior Active Directory EngineerCommented:
Try using unicast mode and check what happened. In unicast mode each cards are connected into "virtual interface" which is represented as single MAC address. For multicast mode it works as separate network cards with separate MACs. As I remember for multicast mode one of your NLB servers require additional network card for management.
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Krzysztof PytkoSenior Active Directory EngineerCommented:
What kind of NLB mode do you use? Multicast or Unicast?
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dinhchung82Author Commented:
I use multicast
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dinhchung82Author Commented:
tks , i find the reason
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