This is a problem that started a couple months ago out of the blue. As far as we know we made no changes to DNS or DHCP.
Suddenly we started getting a lot of computers (I think when their DHCP leases expired) having problems getting DNS records created. They are able to get an IP assigned via DHCP, but no associated A or PTR records are being created. But only for SOME computers. My computer, for example, has not had this problem once, even when my lease expires and is renewed.
A couple other desktop computers in the building have had the same problem half a dozen times.
The way that we've been able to fix it varies, so I'm honestly not sure we're even doing anything or just getting lucky and eventually it starts working. We've tried everything from reboots, to network drivers, to restarting the DHCP/DNS servers to deleting the DHCP and DNS records manually, to assigning static IP addresses.
Nothing seems to work consistently. Sometimes a computer will just suddenly start working and I can never be sure which thing I did made it happen.
Manually assigning DNS records does not work.
We have in our environment 1 DHCP server (well, 2 actually, but the other serves a remote site across a Metro-Ethernet link) and 3 DNS servers. The primary DNS server is the same as the DHCP server. Please ask any other questions if I'm leaving out needed information. I'm not an expert on DNS or DHCP, but I know enough to be dangerous.