okay, we have a plethora of DHCP servers, 2 of which are under my control; they're configured to update DDNS on behalf on non-windows clients (hp jetdirects chiefly) and it works hunky-dory. We have a couple of other DHCP servers run by other orgs, pointed at the same DNS servers; their keepers tell me that they have DDNS enabled the same as I do but the clients that are serviced by them are definitely *not* making it into DNS. the DNSUpdateProxy group has no members so I'm assuming that secure updates aren't enabled on the DNS servers, but I have no access to them as well. Ideas?