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LDAP query works, but GC query fails

Posted on 2008-10-07
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Last Modified: 2012-05-05
A web-based app is querying Active Directory. Everything has been working fine for the past couple of years, but now something is broken.
For all new user accounts added in the past month, they can be found with an LDAP:// query, but searching on the same user account with a GC:// query fails.

Here's a sample of the query. If I leave it as LDAP, then it returns a row for the user results. If I change the query to GC (which I want to since there are >1 domains) I get 0 rows returned, no results.

SELECT
sn,
givenName,
sAMAccountName,
department,
title,
mail,
createTimeStamp,
telephoneNumber,
physicalDeliveryOfficeName
FROM OpenQuery(ADSI,
      'SELECT sn, givenName, sAMAccountName, department, title, mail, createTimeStamp, telephoneNumber, physicalDeliveryOfficeName
      FROM ''LDAP://Pdc'' where objectcategory=''Person'' and objectClass=''User''') ADSI
Where (sn <> 'NULL' and department <> 'NULL' and title <> 'NULL')
AND sAMAccountName = 'newhire'

Nothing that I know of has changed in the environment to cause this to stop working.
any help would be appreciated!!
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Question by:JammyPak
12 Comments
 
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Expert Comment

by:ahoffmann
ID: 22666552
silly question: does your database server support GC:// as source?
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Author Comment

by:JammyPak
ID: 22669816
yes, the GC:// query works fine if I query on different users, it's only new hires from the past month that fail.
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Expert Comment

by:Chris Dent
ID: 22669902

You can query older users in the Global Catalog?

If so, it suggests something is wrong with AD rather than anything else.

DCDiag / NetDiag are always good places to start for that.

Chris
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Author Comment

by:JammyPak
ID: 22671749
yeah...it's funny because when I query for an affected user using dsquery and the -gc option, it finds the user just fine. So it seems that the user is in the global catalog, but I don't know why that gc:// query won't return them.
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Expert Comment

by:Chris Dent
ID: 22672796

Do you have more than one Global Catalog?

Chris
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Expert Comment

by:Chris Dent
ID: 22672804

We could always try a little bit of VbScript to see if it's limited to the query above or is a more general condition.

Chris
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Author Comment

by:JammyPak
ID: 22677782
yes, more than one GC. I've tried pointing at different GCs but the results are the same.
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Assisted Solution

by:Chris Dent
Chris Dent earned 100 total points
ID: 22677912

Want to try a bit of VbScript / PowerShell / .NET to see if we can reproduce the condition? For convenience I'd go for PowerShell, it's quite lovely for quickly testing things :)

http://www.microsoft.com/windowsserver2003/technologies/management/powershell/default.mspx

The script is below, just copy and paste into the PowerShell console. It will search the GC and print the results to the console if it finds any.

Chris
$NewHire = "newhire"
 

$RootDSE = New-Object System.DirectoryServices.DirectoryEntry("LDAP://RootDSE")

$GCRoot = New-Object System.DirectoryServices.DirectoryEntry("GC://" + $RootDSE.Get("rootDomainNamingContext"))

$Filter = "(&(objectClass=user)(objectCategory=person)(sAMAccountName=$NewHire))"

$Searcher = New-Object System.DirectoryServices.DirectorySearcher($GCRoot, $Filter)

$Searcher.FindAll()

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Expert Comment

by:BSonPosh
ID: 22678465
Just another way :)
$Forest = [system.DirectoryServices.ActiveDirectory.Forest]::GetCurrentForest()

$GCRoot = [ADSI]"LDAP://$($forest.FindGlobalCatalog().Name)"

$NewHire = "newhire"

$Filter = "(&(objectClass=user)(objectCategory=person)(sAMAccountName=$NewHire))"

$Searcher = New-Object System.DirectoryServices.DirectorySearcher($GCRoot, $Filter)

$Searcher.FindAll()

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Author Comment

by:JammyPak
ID: 22689077
I'll give it a try and report back...
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Author Comment

by:JammyPak
ID: 22710996
both of those scripts return the affected users just fine.
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Accepted Solution

by:
JammyPak earned 0 total points
ID: 22722437
our webmaster modified his scripts and was able to workaround this issue.
Instead of going via SQL, he's now querying AD directly.

SELECT
SN as lastname,
GIVENNAME as firstname,
cn as fullname,
DEPARTMENT,
sAMAccountName as username FROM  

--OLD WAY
--OpenQuery(ADSI, 'SELECT SN, GIVENNAME, cn, sAMAccountName, DEPARTMENT FROM ''GC://Pdc'' WHERE objectCategory = ''Person'' AND objectClass= ''User''') WHERE (sAMAccountName not like 'admin%' AND DEPARTMENT IS NOT NULL AND GIVENNAME <> 'ADMIN-')

--NEW WAY
OpenQuery( ADSI,'<GC://pdc>;(&(objectCategory=Person)(objectClass=user)(sAMAccountType=805306368)(sn=*)(!sAMAccountName=admin*)(!givenName=ADMIN-)(sn=*)(!sn=Test*)(!sn=Admin*)(!cn=Test*)(!cn=Admin*)(department=*)(userAccountControl:1.2.840.113556.1.4.803:=0));SN,GIVENNAME,cn,sAMAccountName,DEPARTMENT;subtree')
 
order by SN

(note that he's excluding accounts with test and admin in the name...)

thanks
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