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Under certain circumstances, if you change the Dynamic Name Server (DNS) order on a Windows Server 2003 computer configured with a fixed IP address, the pointer (PTR) resource record of the server might disappear from DNS.
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This problem might occur if the following conditions are true:
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1.����������� The Windows 2003 Server is configured with a fixed IP address.
2.����������� There are two DNS servers configured for this computer, both severs are set to host the Active Directory (AD) integrated reverse zone.
3.����������� You change the DNS Server order in the LAN TCP/IP properties user interface, for example from (dnsserver1,dnsserver2) to (dnsserver2,dnsserver1)�
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In this case, you can see the followings in a network trace
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a, A single �delete PTR� request is sent dnsserver1 (old primary)
b, A �delete + add PTR� request is sent to dnsserver2 (new primary)
The �delete +add� request might not mean any change in the current data on dnsserver2.
If that is the case, dnsserver2 responds with �SUCCESS�, but does not change anything in AD, because there is no modification in the data.
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From the AD perspective, we have a single �delete� performed on dnsserver1.
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This gets replicated, and the PTR record is deleted on all DNS servers.
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The PTR record disappears only temporarily, because the host re-registers its records by default every 24 hours.
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To resolve this problem immediately, start a DNS update after changing the DNS server order by executing ipconfig /registerdns at a command prompt on the Windows 2003 machine.
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