Windows Servers not showing up in DNS

I have a single domain with DC's at 7 sites.. Some of my clients are not able to access servers so I started looking around and noticed that several of my file and app servers are not listed in DNS at any locations? The servers are all domain members and I have there local DNS pointing to a DC at each site for name resolution..

Not sure where to start looking as to why these servers are not "registered" in DNS?

who is responsible for registering Clients in DNS?  Is it the local DNS server that is listed on the client or is done through AD?
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Cliff was saying if you didn't allow dynamic updates you would have to create the records manually, but you do allow them...

When talking about dynamic updates, when machines are configured with a static IP, it is the machine's responsibility to register its own record.  When you look at an existing record that was dynamically created, you will see the machine account on the ACL.

Try running ipconfig /registerdns on a machine with a missing record and looking at the DNS server set as primary to see if the record is created.
Cliff GaliherCommented:
It all depends on how you've configured your system. If you've disabled of blocked dynamic DNS updating (common on servers for security reasons) then the "who is responsible" is the IT department. Records are manually created. And if nobody created the records, what you are seeing is expected behavior. I suspect this is the situation.
sullendAuthor Commented:
I do have my AD environment set to only allow Secure updates.. However I dont  understand how any of my servers would be listed if secure update was blocking them from being added.( I have alot of other servers that are in DNS and I have not added them to the DNS manually).  So how did those entries get populated?
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