Windows DHCP not Updating DNS

Our 2012R2 DC's do DHCP and DNS for our environment, but I found that our client's DNS addresses were frequently incorrect, even though DHCP is supposed to update DNS with the correct entry.  Found this blog post that solved our problems:

Note: If you are unsure about running the dnscmd shown in the blog post, I found the commands to verify the setting before you change it, and how to revert:

Show current state:

dnscmd /info /OpenACLOnProxyUpdates

Desired state:

dnscmd /config /OpenAclOnProxyUpdates 0

Revert to default:

dnscmd /config /OpenAclOnProxyUpdates 1