[THIN] DNS client settings through GPOs not applying

Hi all:
I need to change the settings for DNS servers on several PCs.  I'm trying to do this by using the GPO setting:
Computer Configuration/Administrative Templates/Network/DNS Client/DNS Servers
I am using two IP addresses separated by a space.
The PCs are Windows XP SP3.

I've run gpresult and the policy seems to be applying, but the DNS servers are not changed.
I've done a gpupdate /force and rebooted a couple of times.
Yes, the PCs are in the correct OU where the policy is applied.

Anyone seen this before?

_______________________________
Hector Minero