PTR Record disappearing from AD Integrated zone

  • Thread starter Thread starter =?ISO-8859-9?Q?Oktay_G=FCr?=
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=?ISO-8859-9?Q?Oktay_G=FCr?=

Hello,
We have this weird occurance we have been trying to figure out recently.
Every few days, we will have a record from DNS reverse zone (which is AD
Integrated) disappear.The record that disappears is a Domain Controller.
The forward record stays. Only the Reverse will disappear.
There is no fix cycle. This happens randomly but every few days apart.
Not a fix number of days. Just any day after few days. It has happened
once or twice in succession like very next day or so.
We have tried disabling auto registration on NIC. We have manually
created DNS records (forward and reverse) using DNS. Nothing seems to
help.It's really becoming more of a concern now as we have certain
application relying on that which screams everytime that PTR disappears.
Any and everything that can help is welcome.

Our system W2k3-R2 with Exchange2003 Ent
 
In
Oktay Gür said:
Hello,
We have this weird occurance we have been trying to figure out
recently. Every few days, we will have a record from DNS reverse zone
(which is AD Integrated) disappear.The record that disappears is a
Domain Controller. The forward record stays. Only the Reverse will
disappear. There is no fix cycle. This happens randomly but every few
days
apart. Not a fix number of days. Just any day after few days. It has
happened once or twice in succession like very next day or so.
We have tried disabling auto registration on NIC. We have manually
created DNS records (forward and reverse) using DNS. Nothing seems to
help.It's really becoming more of a concern now as we have certain
application relying on that which screams everytime that PTR
disappears. Any and everything that can help is welcome.

Our system W2k3-R2 with Exchange2003 Ent
Click to expand...


Is the DC multihomed?
What DNS addresses are in the DC's IP properties?
Is the zone AD integrated or a primary or secondary zone?


--
Regards,
Ace

This posting is provided "AS-IS" with no warranties or guarantees and
confers no rights.

Ace Fekay, MCSE 2003 & 2000, MCSA 2003 & 2000, MCSE+I, MCT, MVP
Microsoft MVP - Directory Services
Microsoft Certified Trainer

Infinite Diversities in Infinite Combinations

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Ace Fekay [MVP] yazmýþ:
In


Is the DC multihomed?
What DNS addresses are in the DC's IP properties?
Is the zone AD integrated or a primary or secondary zone?
Click to expand...
Sorry for late answers;

DC isnt multihomed.It s just making web server.It is Ad integrated and
primary zone registered.,Here my DNS and IP configuration: (all ip is
fake for the security reason ,sorry for that)..

NETWORK IP CONFIG
IP ADD: 85.85.85.85
NETMASK:X.X.X.X
GATEWAY:X.X.X.X
PRIMARY DNS :85.85.85.85
SECONDRY DNS :212.212.212.212

DNSMNGT CONFIG:
Forward Lookup Zone

for mydomain.com ====>

(same as parent folder) Name Server (NS) ns1.mydomain.com.
(same as parent folder) HOST (A) 85.85.85.85
ftp HOST (A) 85.85.85.85
mail HOST (A) 85.85.85.85
ns1 HOST (A) 85.85.85.85
www Alias (CNAME) ns1.mydomain.com.
(same as parent folder) Mail Exchanger (MX) [10]
mail.mydomain.com
(same as parent folder) Start Of Authority (SOA) [200]
ns1.mydomain.com.


Reverse Lookup Zone

85.85.85.X Subnet ====>

(same as parent folder) Name Server (NS) ns1.mydomain.com.
(same as parent folder)Start Of Authority (SOA) [120] ns1.mydomain.com.
85.85.85.85 Pointer (PTR) ns1.mydomain.com.
 
In
Oktay Gür said:
Sorry for late answers;

DC isnt multihomed.It s just making web server.It is Ad integrated and
primary zone registered.,Here my DNS and IP configuration: (all ip is
fake for the security reason ,sorry for that)..

NETWORK IP CONFIG
IP ADD: 85.85.85.85
NETMASK:X.X.X.X
GATEWAY:X.X.X.X
PRIMARY DNS :85.85.85.85
SECONDRY DNS :212.212.212.212

DNSMNGT CONFIG:
Forward Lookup Zone

for mydomain.com ====>

(same as parent folder) Name Server (NS)
ns1.mydomain.com. (same as parent folder) HOST (A)
85.85.85.85 ftp HOST (A)
85.85.85.85
mail HOST (A) 85.85.85.85
ns1 HOST (A) 85.85.85.85
www Alias (CNAME)
ns1.mydomain.com. (same as parent folder) Mail Exchanger
(MX) [10] mail.mydomain.com
(same as parent folder) Start Of Authority (SOA) [200]
ns1.mydomain.com.


Reverse Lookup Zone

85.85.85.X Subnet ====>

(same as parent folder) Name Server (NS) ns1.mydomain.com.
(same as parent folder)Start Of Authority (SOA) [120]
ns1.mydomain.com. 85.85.85.85 Pointer (PTR)
ns1.mydomain.com.
Click to expand...

If your DNS server is 85.85.85.85,then what is 212.212.212.212? That's your
secondary DNS. Why is that there? Is that an ISP's DNS? Does it host
mydomain.com zone or your reverse zone? If it does not host the mydomain.com
zone, or the reverse zone, then REMOVE it. THis is important for AD as well
as your PTR issue. ONLY use hte internal DNS.

Ace
 
Ace Fekay [MVP] yazmýþ:
In
Oktay Gür said:
Sorry for late answers;

DC isnt multihomed.It s just making web server.It is Ad integrated and
primary zone registered.,Here my DNS and IP configuration: (all ip is
fake for the security reason ,sorry for that)..

NETWORK IP CONFIG
IP ADD: 85.85.85.85
NETMASK:X.X.X.X
GATEWAY:X.X.X.X
PRIMARY DNS :85.85.85.85
SECONDRY DNS :212.212.212.212

DNSMNGT CONFIG:
Forward Lookup Zone

for mydomain.com ====>

(same as parent folder) Name Server (NS)
ns1.mydomain.com. (same as parent folder) HOST (A)
85.85.85.85 ftp HOST (A)
85.85.85.85
mail HOST (A) 85.85.85.85
ns1 HOST (A) 85.85.85.85
www Alias (CNAME)
ns1.mydomain.com. (same as parent folder) Mail Exchanger
(MX) [10] mail.mydomain.com
(same as parent folder) Start Of Authority (SOA) [200]
ns1.mydomain.com.


Reverse Lookup Zone

85.85.85.X Subnet ====>

(same as parent folder) Name Server (NS) ns1.mydomain.com.
(same as parent folder)Start Of Authority (SOA) [120]
ns1.mydomain.com. 85.85.85.85 Pointer (PTR)
ns1.mydomain.com.
Click to expand...

If your DNS server is 85.85.85.85,then what is 212.212.212.212? That's your
secondary DNS. Why is that there? Is that an ISP's DNS? Does it host
mydomain.com zone or your reverse zone? If it does not host the mydomain.com
zone, or the reverse zone, then REMOVE it. THis is important for AD as well
as your PTR issue. ONLY use hte internal DNS.

Ace
Click to expand...
Yes It was (212.212.212.212)my secondary dns but not anymore because i
deleted after you tell me.And I created PTR records for my A records
and start to waiting up.?.!!!!!!!Why i cant use to secondary dns for my
external DNS server...!!?
 
Oktay Gür yazmýþ:
Ace Fekay [MVP] yazmýþ:
In
Oktay Gür said:
Sorry for late answers;

DC isnt multihomed.It s just making web server.It is Ad integrated and
primary zone registered.,Here my DNS and IP configuration: (all ip is
fake for the security reason ,sorry for that)..

NETWORK IP CONFIG
IP ADD: 85.85.85.85
NETMASK:X.X.X.X
GATEWAY:X.X.X.X
PRIMARY DNS :85.85.85.85
SECONDRY DNS :212.212.212.212

DNSMNGT CONFIG:
Forward Lookup Zone

for mydomain.com ====>

(same as parent folder) Name Server (NS) ns1.mydomain.com.
(same as parent folder) HOST (A) 85.85.85.85
ftp HOST (A) 85.85.85.85
mail HOST (A) 85.85.85.85
ns1 HOST (A) 85.85.85.85
www Alias (CNAME) ns1.mydomain.com.
(same as parent folder) Mail Exchanger
(MX) [10] mail.mydomain.com
(same as parent folder) Start Of Authority (SOA) [200]
ns1.mydomain.com.


Reverse Lookup Zone

85.85.85.X Subnet ====>

(same as parent folder) Name Server (NS) ns1.mydomain.com.
(same as parent folder)Start Of Authority (SOA) [120]
ns1.mydomain.com. 85.85.85.85 Pointer (PTR)
ns1.mydomain.com.
Click to expand...

If your DNS server is 85.85.85.85,then what is 212.212.212.212? That's
your secondary DNS. Why is that there? Is that an ISP's DNS? Does it
host mydomain.com zone or your reverse zone? If it does not host the
mydomain.com zone, or the reverse zone, then REMOVE it. THis is
important for AD as well as your PTR issue. ONLY use hte internal DNS.

Ace
Click to expand...
Yes It was (212.212.212.212)my secondary dns but not anymore because i
deleted after you tell me.And I created PTR records for my A records
and start to waiting up.?.!!!!!!!Why i cant use to secondary dns for my
external DNS server...!!?
Click to expand...


nope ..doesnt matter.Still same..PTR records disappeared after 8
hours.what else i can make it plaese help....??
 
In
Oktay Gür said:
Yes It was (212.212.212.212)my secondary dns but not anymore because i
deleted after you tell me.And I created PTR records for my A records
and start to waiting up.?.!!!!!!!Why i cant use to secondary dns for
my external DNS server...!!?
Click to expand...

Why??? Here's a copy of most of the information on AD & DNS. I hope it helps
you with other AD and DNS issues. If you have any questions, please post
back.

__________________________
__________________________
AD & DNS:

Just an FYI about AD, DNS, authentication, finding the domain, GPOs, RPC
issues, etc:

I usually see these sort of errors (GPOs not working, can't find the domain,
RPC issues, etc), when the ISP's DNS servers are listed on a client, DCs
and/or member servers. If you have your ISP's DNS addresses in your IP
configuration (all DCs, member servers and clients), they need to be REMOVED
and ONLY use the internal DNS server(s). This is what is causing the whole
problem.Just a little background: AD uses DNS. DNS stores AD's resource and
service locations in the form of SRV records, hence how everything that is
part of the domain will find resources in the domain. If the ISP's DNS is
configured in the any of the internal AD member machines' IP properties,
(including all client machines and DCs), the machines will be asking the
ISP's DNS 'where is the domain controller for my domain?", whenever it needs
to perform a function, (such as a logon request, replication request,
querying and applying GPOs, etc). Unfortunately, the ISP's DNS does not have
that info and they reply with an "I dunno know", and things just fail.
Unfortunately, the ISP's DNS doesn't have information or records about your
internal private AD domain, and they shouldn't have that sort of
information.

Also, don't use use the router as a DNS or DHCP server either. If you are
using your NT4 as a DNS server in your AD domain, change it over to Win2003
DNS. Same with DHCP. NT4 DNS cannot support AD's SRV requirements and
dynamic updates.

If there are multiple DNS entries in the IP properties of a machine (whether
a DC, member server or client), it will ask the first DNS entry in the list
first. If it doesn't have the answer, it will go to the second entry, but it
REMOVES the first entry from the "eligible resolvers" list, and won't go
back to it. This can cause issues within AD when accessing a resource such
as a printer, folder, getting GPOs to function, etc. Another good reason to
ONLY use the internal DNS server(s).

For Internet resolution, the Root Hints will be used by default, unless a
root zone exists (looks like a period or dot "." zone). Therefore, the
recommended "best practice" to insure full AD and client functionality is to
point all machines ONLY to the internal server(s), and configure a forwarder
to your ISP's DNS. This way all machines query your DNS and if it doesn't
have the answer, it asks outside. If the forwarding option is grayed out,
delete the Root zone (that dot zone). If not sure how to perform these two
tasks, please follow one of the two articles listed below, depending on your
operating system. They show a step by step on how to perform these tasks.

291382 - Frequently asked questions about Windows 2000 DNS and Windows
Server 2003 DNS
http://support.microsoft.com/?id=291382

323380 - HOW TO Configure DNS for Internet Access in Windows Server 2003
(forwarding) :
http://support.microsoft.com/?id=323380

300202 - HOW TO Configure DNS for Internet Access in Windows Server 2000
(forwarding) :
http://support.microsoft.com/?id=300202

825036 - Best practices for DNS client settings in Windows 2000 Server and
in Windows Server 2003
http://support.microsoft.com/?id=825036

Common Mistakes When Upgrading a Windows 2000 Domain To a Windows 2003
Domain (whether it was upgraded or not, this is full of useful information
relating to AD and DNS, among other info):
http://support.microsoft.com/?id=555040

Domain Controller's Domain Name System Suffix Does Not Match Domain Name:
http://support.microsoft.com/?id=257623

Clients cannot dynamically register DNS records in a single-label forward
lookup zone:
http://support.microsoft.com/?id=826743

300684 - Information About Configuring Windows 2000 for Domains with
Single-Label DNS Names
http://support.microsoft.com/?id=300684

828263 - DNS query responses do not travel through a firewall in Windows
Server 2003:
http://support.microsoft.com/?id=828263


Posted 5/22/07
Do not configure the DNS client settings on the domain controllers to point
to your Internet Service Provider's (ISP's) DNS servers:
http://smtp25.blogspot.com/2007/05/do-not-configure-dns-client-settings-on_818.html


__________________________
__________________________
Ace
 
In
Oktay Gür said:
Oktay Gür yazmýþ:

nope ..doesnt matter.Still same..PTR records disappeared after 8
hours.what else i can make it plaese help....??
Click to expand...

Did you try to create the records manually or automatically?

Ace
 
Ace Fekay [MVP] yazmýþ:
In

Did you try to create the records manually or automatically?

Ace
Click to expand...
Yes.I tried that but didnt work.Should i install SP2.?.
 
In
Oktay Gür said:
Ace Fekay [MVP] yazmýþ:
Yes.I tried that but didnt work.Should i install SP2.?.
Click to expand...

There is not much of a secret as to how DNS registration works. SImply,
create a zone, allow updates on the zone (allow secure and non-secure to
simplify it), make absolutely sure that this DNS server is the ONLY DNS
server in IP properties, and it just works.

If there are multiple DCs with the zone, depending on how you created the
other DC/DNS can cause issues. If you installed another DC into the same
domain or at least intot he same replication scope and install DNS on the
server, you simply just WAIT until the zone automatically appears. If you
tried to manually create the zone, which already exists in AD (since it is
AD integrated), then you've just created a duplicate zone. Hence what could
be happening.

You may also have dupe zones in the DomainNC and in DomainDnsZones and/or
ForestDnsZones app partitions.

To verify this is true or not, you will need ADSI Edit. Here's some help...

__________________________
If you have a duplicate, that's telling me that there is a zone that exists
in the DomainNC and in the DomainDnsZones Application partition. This means
at one time, or currently, you have a mixed Win2000/2003 environment and you
have DNS installed on both operating systems. On Win2000, if the zone is AD
Integrated, it is in the DomainNC, and should be set the same in Win2003's
DC/DNS server to keep compatible. Someone must have attempted to change it
in Win2003 DNS to put it in the DomainDnsZones partition no realizing the
implications, hence the duplicate. In a scenario such as this where you want
to use the Win2003 app partitions, you then must insure the zone on the
Win2003 is set to the DomainNC, then uninstall DNS off the Win2000 machine,
then once that's done, you can then go to the Win2003 DNS and change the
partition's replication scope to one of the app partitions.

In ADSI Edit, you can view all five partitions. You were viewing the app
partitions, but not the main partitions. You need to add the DomainNC
partition in order to delete that zone. But you must uninstall DNS off the
Win2000 server first, unless you want to keep the zone in the DomainNC. But
that wouldn't make much sense if you want to take advantage of the _msdcs
zone being available forest wide in the ForestDnsZones partition, which you
should absolutley NOT delete. I would just use the Win2003 DNS servers only.

In ADSI Edit, rt-click ADSI Edit, connect to, in the Connection Point click
on "Well known Naming Context", then in the drop-down box, select "Domain".
Drill down to CN=System. Under that you will see CN=MicrosoftDNS. You will
see the zone in there.

But make sure to decide FIRST which way to go before you delete anything.

Some reading for you...
Directory Partitions:
http://www.microsoft.com/resources/...server/reskit/en-us/distrib/dsbg_dat_favt.asp

kbAlertz- (867464) - Explains how to use ADSI Edit to resolve app partitions
issues:
http://www.kbalertz.com/kb_867464.aspx
__________________________

Ace
 
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