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sbs 2003 DNS settings reverting to external ISP settings

Posted on 2011-04-19
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Last Modified: 2012-05-11
I notived that our SBS 2003 server was acting strangely.  After further investigation I notived that the DNS settings on the local NIC were pointing to the external ISP DNS servers.  I changed this to point to itself but after a few minutes it reverts back to the enternal IP address.  I have run a search on the entire registry and find that it is only listed on this one interface.  I have tried to change them in the registry but it reverts back to the external addresses after a few minutes.  The single router is not running dhcp, the forwarders on DNS server settings is correct.  Not sure where else to look.
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Question by:PaulJohannesMarais
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Expert Comment

by:ittogo
ID: 35423933
Is the server getting it's address from a DHCP reservation?  If it is, just set it to a static address.  Check that you DHCP server has the SBS server as the primary DNS.
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Author Comment

by:PaulJohannesMarais
ID: 35423954
no the servers ip address is fixed, and the DHCP settings are configured to point to the fixed ip of the server
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Author Comment

by:PaulJohannesMarais
ID: 35423979
in the registry, the server interface has a registry setting "Nameserver" which keeps verting back to the external dns settings.  in the same registry key enableDHCP is 0.  
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Author Comment

by:PaulJohannesMarais
ID: 35424008
Also , originaly there was a problem when you tried to change the DNS settingson the server NIc stating that another network adapter had the same ip address although it wasn't physically connected to the server.  According to a microsoft KB article this can happen when the NIC card is moved to another slot.  I opened the management console showing hidden devices and removed the orphan nic.  It was suffereing the problem of reverting to the external IP addresses before I made this change.
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Expert Comment

by:ittogo
ID: 35424097
Try reseting the internet protocol on the server (http://support.microsoft.com/kb/317518).  This has the effect of removing the stack and reintalling it, and should get rid of any ghosts from the orphan card, which is what is probably causing the problem
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Author Comment

by:PaulJohannesMarais
ID: 35424236
Waiting for the client to give the go ahead to reboot the server.
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Author Comment

by:PaulJohannesMarais
ID: 35424319
I have run the netsh reset command and can reboot the server in 1hr 30 minutes.  Will inform you of the result.  FYI, the ip settings were reset to auto assigned (as was mentioned in the KB article).  I set the NIC to the correct setttigns but problem still persists.  I am assuming this is because the server has not been rebooted yet.
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Author Comment

by:PaulJohannesMarais
ID: 35425585
No joy, DNs settings still reverting back to external IP after 5 minutes or so.  Pulling my hear out on this one
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LVL 9

Expert Comment

by:ittogo
ID: 35425647
Couple more drastic things you could try.  Remove the device driver for the all the NIC and then have the system re-discover them.  Or you could add a new NIC card and move over to it, hoping that the problem doesn't follow.  
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Accepted Solution

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PaulJohannesMarais earned 0 total points
ID: 35426323
OK, finally found what was causing the problem.  The client had installed a DYNDNS client on the server which was somehow changing the DNS settings on the server NIC.  Uninstalled that and the problem has gone away.  Thanks for your help ittogo.
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Author Comment

by:PaulJohannesMarais
ID: 35426473
Solved problem myself
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Author Closing Comment

by:PaulJohannesMarais
ID: 35455564
Solved the problem myself
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