Windows servers triying to update my zone

[joans4nz]

Hi,

I am working as a litle ISP in a building giving service to a few
enterprises. All entresprises are using private ip addresses. Only my
servers have public ip addresses. In all entreprises exist a dns server that
are subdomains of my domain and my dns servers are showing the following
logs messages:

Apr 7 20:00:19 myserver named[67312]: client 172.16.0.153#2100: view
interna: update 'mydomain.com/IN' denied
Apr 7 20:01:28 myserver named[67312]: client 172.16.0.146#2122: view
interna: update 'mydomain.com/IN' denied
Apr 7 20:02:37 myserver named[67312]: client 172.16.0.161#2138: view
interna: update 'mydomain.com/IN' denied
Apr 7 20:03:45 myserver named[67312]: client 172.16.0.153#2154: view
interna: update 'mydomain.com/IN' denied
Apr 7 20:04:54 myserver named[67312]: client 172.16.0.146#2186: view
interna: update 'mydomain.com/IN' denied

All the sub-domain dns server are runnin on Windows and are behid a
firewall. I try a solution from the book DNS & bind Cookbook but the problem
was not solutioned.

How fix this problem?

Thanks to all,

joans4nz
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