Question

Reverse Lookup Zone Issues

Asked by: leehewson

Hi Experts, We have a domain where the client logins are quite slow. Ive been looking around and have found that the reverse lookup zone has a different subnet to the rest of the network. Local IP addresses are 10.0.0.x and the reverse zone has 10.0.2.x

Ive checked the DNS event log and get the following 4007 errors;
1.
The DNS server was unable to open zone _msdcs.hallamplastics.co.uk in the Active Directory from the application directory partition ForestDnsZones.hallamplastics.co.uk. This DNS server is configured to obtain and use information from the directory for this zone and is unable to load the zone without it. Check that the Active Directory is functioning properly and reload the zone. The event data is the error code.

2.
The DNS server was unable to open zone hallamplastics.co.uk in the Active Directory from the application directory partition DomainDnsZones.hallamplastics.co.uk. This DNS server is configured to obtain and use information from the directory for this zone and is unable to load the zone without it. Check that the Active Directory is functioning properly and reload the zone. The event data is the error code.

Would the issues with the reverse lookup zone give slow logins and how do I fix the errors?

Thanks Simon

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Asked On
2009-10-01 at 07:18:27ID24777030
Tags

DNS

,

Server 2003

,

reverse lookup zone

Topics

Domain Name Service (DNS)

,

Windows 2003 Server

,

SBS Small Business Server

Participating Experts
3
Points
500
Comments
8

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Answers

 

by: Chris-DentPosted on 2009-10-01 at 07:25:04ID: 25468959


The two errors you're getting... Do they coincide with a reboot? Or occur on a regular basis?

Is DCDiag clear of errors?

You can delete and re-create the Reverse Lookup zone if you wish, no harm there. That should have no impact at all on domain logon though.

Chris

 

by: thehagmanPosted on 2009-10-01 at 07:41:27ID: 25469173

The errors you list seem to be related to the *forward* zone, I'm afraid. Anyyway, follow Chris-Dent's advice and check with DCdiag first.
Anyway, how come you have the wrong reverse zone in the first place? Unless you have an additional subnet somewhere it shouldn't even be populated.

If the events occur only at boot time (i.e. when DNS server is ready but AD is not) or you booted in Active Directory Restore mode or some other form of Safe Mode, you can ignore it.

Have any "dangerus" operations been performed in the past like
- domain rename
- AD removed

 

by: leehewsonPosted on 2009-10-01 at 07:52:53ID: 25469344

Hi Guys

Just ran Dcdiag - all tests passed ok but there are 4 services that are stopped

IsmServ
RPCLOCATOR
TrkWks
TrkSvr

The server is an SBS DC with another windows 2003 server and a 2000 server too. The errors occur throughout the day and I dont think anything has been altered.

To recreate the reverse lookup it is simply a matter of deleting the current zone or is there more to it than that?

Cheers Simon

 

by: DrDave242Posted on 2009-10-01 at 08:27:13ID: 25469733

Those services don't run by default on an SBS 2003 server, so I wouldn't worry too much about them.

You are correct; creating the correct reverse lookup zone involves simply deleting the old one and creating a new one, but as has already been said, that's not what's causing slow client logons.  Just to make sure the basics are covered, are all of your clients using only internal DNS servers?

 

by: leehewsonPosted on 2009-10-05 at 02:18:55ID: 25493535

Hi guys, we have traced the slow logins to a service that was trying to run. Disabling this has cut the login time to 3 minutes. Thanks for the pointers. Im still getting the 4007 errors in the DNS - can you give me some ideas on a resolution? The errors do not coincide with any reboots and have occured on the following dates; 31/08, 08/09, 13/09, 23,09, 01/10 and 5/10

Cheers

 

by: leehewsonPosted on 2009-10-05 at 02:22:22ID: 25493554

In the SOA the responsible user is hostmaster.hallamplastics.co.uk - would this cause any issues?

Just a idea!!!

 

by: Chris-DentPosted on 2009-10-05 at 02:23:38ID: 25493558


Nope, it's just a text string intended for human consumption, it translates to an e-mail address if you replace the first period (.) with at (@). It's always a good idea to make it accurate if you run a public DNS service, but for private use it doesn't matter at all.

Chris

 

by: DrDave242Posted on 2009-10-05 at 12:12:59ID: 25498518

Try this:

On your DC, open the DNS console, right-click one of your forward lookup zones, and select properties.
Click the Change button next to "Type: Active-Directory Integrated."
In the window that appears, leave the "Primary" radio button selected, but uncheck the box for "Store the zone in Active Directory."
Click OK.
Confirm that you wish to perform the operation.
Click OK to close the properties window.

This moves that zone out of the AD database and stores it as a simple text file.  Follow the same procedure for the other forward lookup zone.

You could conceivably leave the zones like this; the server will still resolve all queries to those zones, and the error messages will be gone because the zones will no longer be loaded from AD.  However, you won't be able to allow secure dynamic updates to the records in those zones, and this could present a security risk (or a bit of a maintenance headache, depending on whether you choose to allow dynamic updates at all).  A better option would be to go through the procedure again, re-checking the "Store the zone in AD" box for each zone.  Make sure to re-enable secure dynamic updates before closing each zone's properties window.

Hopefully, taking the zones out of AD and putting them back in will fix whatever was causing the errors.

20120131-EE-VQP-002

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