We are running 6.5 sp4 and have had dhcp and dynamic dns working correctly
in one subnet. We have needed to add subnets to accommodate growth. However
the Dynamic dns does not work for those new subnets. We see an "Cannot add
FQDN: <wsname><domain> with address: <ipadress> to DNS server" on the server
console. I can not even figure out what a FQDN is much less how to fix it.

I am sure it is something simple, anyone have any ideas?

Yesterday it worked.
Today it is not working.
Windows is like that.