Static IP switches to DHCP automatically in Windows Server 2008 R2 x64

deloachjd used Ask the Experts™
I’m rebuilding six physical servers to Windows Server 2008 R2 x64 and they are not holding the static IP address that I’m providing them.  It will work temporarily, but after a short period of time the IP and subnet mask is missing only leaving the default gateway and DNS set which will pull an IP from DHCP from one of the other NIC’s (This happens even if the other NIC’s are disabled!)

I have disabled IP6 on all of the NIC adaptors and tried several times changing IP back to static.  I have searched Google and discovered that I'm not the only one who discovered this issue.  The only answer I found is to create a DHCP reservation, but I don't like this solution.  The NIC's installed in these servers are 2x HP NC7170 Dual Gigabit, and 2x NC7782 Gigabit.  The driver version is dated from 1/12/2008.  According to Windows Updates these are the current NIC drivers.  

Has anybody come across this before and if so what is the fix?
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PowerEdgeTechIT Consultant
Top Expert 2010
You might check to see if there is a firmware update for the NIC's ... Broadcom's in some Dell servers had similar issues which were fixed with a driver release, but the firmware on the NIC had to be updated as well for the driver to to be completely successful.  I've yet to have any problems with my R2 machines.
Are you teaming the nics?


The NIC's are not teamed.

Hi del,

This could be an indication of duplicate IPs on the network. Please confirm that the iP you are trying to use doesnt exist.

Hi guys,

I appologize for responding so late and thank you all for you feedback.  I have worked with Microsoft on this issue and here is the fix.

If DNS registration is initiated on Windows Server 2008, it registers DNS record for all IP addresses. To fix this issue the hotfix ( was released. But this issue still present in Windows Server 2008 R2, and it is not fixed till date. As an alternative, you can disable DNS registration on all NICs of Windows Server 2008 R2, and create a static record for the desirable IP address.


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