Re: What do I do now?

I can't tell you how this all happened but I can help give some insight.

1) Do you have dns scavenging enabled. If enabled scavenging can drop
even static records if the "Delete this record when it becomes stale" check
box is set
2) To reregister your srv records
a) Restart netlogon on a dc they are missing from
b) Run a netdiag /fix on the dc they are missing from

Hope this can get you started, you shouldn't need to reload from a system
state backup

--
Paul Bergson
MVP - Directory Services
MCTS, MCT, MCSE, MCSA, Security+, BS CSci
2008, 2003, 2000 (Early Achiever), NT4

http://www.pbbergs.com

Please no e-mails, any questions should be posted in the NewsGroup
This posting is provided "AS IS" with no warranties, and confers no rights.

"atomax@xxxxxxxxxxxxx" <atomax@xxxxxxxxx> wrote in message
news:%2391kCBp0IHA.3920@xxxxxxxxxxxxxxxxxxxxxxx
We just suffered the weirdest problem.

First, a description of our network.
We have a single Windows 2003 domain in 2 sites, both visible in ADS&S. We
have a total of 5 DCs each of which is also a DNS server, 3 in one site, 2
in the other. There are 2 GCS in each site. We have 3 Exchange server, one
backend in each site, and one frontend. Beyond these servers, we have a
number of Windows servers, some production and some for development and
testing. We also have a large number of Linux servers, Windows and Linux
workstations.

All of the Windows and Linux servers, except 1 Windows server (which uses
DHCP), have static allocated IPs, with A records configured in the DNS. We
have a number of Windows workstations with fixed IPs, and a small number
of Windows and Linux boxes that have reserved IPs in the DHCP scope.

Last night ~6:15 PM, the A records of all of the static Windows servers in
both sites, except for the DCs, disappeared, including all 3 Exchange
servers. The MX records stayed. The CNAMEs also disappeared for those
boxes. None of the Linux boxes losts their A records. We did notice, after
manually recreating most of the A records, that at least some of the PTRs
in the reverse zones remained.

Worse, we then found that the Domain subfolders, like -MSDCS DC, GC, had
each lost its subfolder for one of the sites. We figured we'd need to do a
restore from backup, but decided to wait a bit, to see what else we could
find missing.

Well, now a few hours later, the situation has morphed again. The -MSDCS
DC, GC now have subfolders for both sites again, as far as we know,
without human input. However, in one of the sites, only one of 3 DCs is
showing. In the other site, both DCs appear.

My questions are:
1. What happened? How do manually entered A records simply disappear?
2. Do I manually restore the AD with a backup of a earlier system state,
in order to retrieve the missing srv records?

Any help will be appreciated

Max


.

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