Question

AD "Log On To..." Changes from All Computers to The Following Computers

Asked by: MattShadbolt

OK, here is a doosy guys!

I've been working on this for about a day and thought it was probably time to ask the community.

I've got a Native 2003 domain with three 08 DCs and one 03 DC. As of last week (while I was on holidays) all of the domains user accounts have been changing their logon-workstations attributes from "All Computers" to "The following computers"... the list of the following computers is only about 30 machines and subsiquently the users can't login to their workstations.

After carefull investiagtion, I've found that the list of computers that show up in "The following computers" are all servers - either 03 or 08 and they spread across different OU's (and even some in the default Computers container)

I've disabled all Group Policies, scoured the logs and can't come up with an answer. The issue seems to re-occur about ever 4 hours. Its affecting ALL users, including disabled users, service accounts and across the whole domain.

When the user account is disallowed access to the server (before I manually change it back to "All Computers" errors are reported on the local machine as below. Of course I've googled every possible error message/description.
Once I change every account back to "All Computers" the users have their normal full access.

Appreciate any help and would gladly award the points to anyone who helps me troubleshoot!

Cheers.

Source: LSASRV
Cat: SPNEGO
Event ID: 40960
The Security System detected an attempted downgrade attack for server cifs/DOMAIN-CONTROLLER.  The failure code from authentication protocol Kerberos was "The user account is restricted such that it may not be used to log on from the source workstation.
 (0xc0000070)".
 
then
 
Source: LSASRV
Cat: SPNEGO
Event ID: 40960
The Security System detected an attempted downgrade attack for server cifs/LINCOLN-FS1.  The failure code from authentication protocol Kerberos was "The user account is restricted such that it may not be used to log on from the source workstation.
 (0xc0000070)".

                                  
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Asked On
2009-02-02 at 16:30:28ID24106718
Tags

Active Directory Logon-Workstations

Topics

Active Directory

,

Windows 2003 Server

,

Windows Server 2008

Participating Experts
2
Points
300
Comments
14

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Answers

 

by: itilitiPosted on 2009-02-02 at 20:17:20ID: 23534041

I am having the exact same problem. It seems like it happened after an update to EBS 2008. Did you ever figure it out?   It almost seems like it is a local computer policy that gets changed on the local machine, but I cant find any script running that would change it. I also have disabled all our GPO's and it is still happening.  Please help...

 

by: MattShadboltPosted on 2009-02-02 at 21:12:05ID: 23534224

I've enabled verbose logging on all AD changes and set the local audit policy to full... now I just need to wait until it happens again and see what they tell me.

 

by: MattShadboltPosted on 2009-02-03 at 16:43:30ID: 23543974

I've got a little more info after 24 hours of verbose logging.

First of all, there is one other person who is having the same issues (is this you itiliti?) http://www.petri.co.il/forums/showthread.php?p=145064#post145064 and there is no solution posted.

here is what i've found:
1. the changes to the user accounts are happening every 8 hours (2.35am, 10.35am and 6.35pm)
2. i've checked all hidden Scheduled tasks - no tasks ran at these times.
3. Right before the changes start to take place there is a Directory Service log action
Source = ActiveDirectory_DomainService
Task Category = Directory Access
Event ID = 1174
General = Internal event: A privileged operation (rights required = 0x) was successfully performed on object CN=msWssgConfig,CN=System,DC=DOMAIN,DC=local.
4. the next log entry is from the same source
Internal event: A privileged operation (rights required = 0x) was successfully performed on object CN=msWssgActiveServers,CN=System,DC=DOMAIN,DC=local.
** this seems more than coincidental to me... that a AD change is make to an object called "ActiveServers" and then the user accounts userWorkstation attribute is changed to only servers**
5. then the changes start to happen to the user accounts:
Directory Services Log.
Source = ActiveDirectory_DomainService
Task Category = Directory Access
Event ID = 1174
General =Internal event: A privileged operation (rights required = 0x) was successfully performed on object S-1-5-21-3175168191-426460341-1888045963-1661.
Security Log.
Source = Microsoft Windows Security auditing
Task Category = User Account Management
Event ID = 4738
General =
A user account was changed.

Subject:
      Security ID:            SYSTEM
      Account Name:            LOCAL-SERVER$
      Account Domain:            DOMAIN
      Logon ID:            0xb721904

Target Account:
      Security ID:            DOMAIN\Username
      Account Name:            Username
      Account Domain:            DOMAIN

Changed Attributes:
      SAM Account Name:      -
      Display Name:            -
      User Principal Name:      -
      Home Directory:            -
      Home Drive:            -
      Script Path:            -
      Profile Path:            -
      User Workstations:      SERVER1, SERVER2, SERVER3, etc
      Password Last Set:      -
      Account Expires:            -
      Primary Group ID:      -
      AllowedToDelegateTo:      -
      Old UAC Value:            -
      New UAC Value:            -
      User Account Control:      -
      User Parameters:      -
      SID History:            -
      Logon Hours:            -

Additional Information:
      Privileges:            -

This runs through every user... I then have to change them back manually.
6. The PID that this runs under is 628 LSASS.EXE

Hope this info helps!

 

by: itilitiPosted on 2009-02-03 at 17:03:38ID: 23544084

Yes, I am having the exact same issue on my EBS 2008 installation. Everything has been running fine for about 2 weeks, and now this happens every 6 hours. I have spent well over 10 hours researching this sissue. I am about to call M$... There are no running tasks, or anything like that . it is really annoying...need help...

 

by: MattShadboltPosted on 2009-02-03 at 19:39:51ID: 23544791

yeah give MS a call... I'd appreciate hearing what they have to say

 

by: MattShadboltPosted on 2009-02-03 at 21:45:30ID: 23545284

Hey itiliti.

Any word from MS? It's killing me!

In the mean time I've written a script that I'm going to schedule that will reverse this issue... luckily for me its happening at predictable times - but for you it will be a lot easier than manually doing it. Anyway, you just need to change the LDAP path to your users OU. (I take no responsibility if it doesn't work!)

Please post as soon as you hear from MS.

Thanks,
Matt

Const ADS_PROPERTY_CLEAR = 1
 
Set objOU = GetObject("LDAP://OU=Users OU, DC=DOMAIN, DC=Local")
objOU.Filter = Array("User")
 
For Each objItem in objOU
	objItem.PutEx ADS_PROPERTY_CLEAR, "userWorkstations", 0
	objItem.SetInfo
Next

                                              
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by: itilitiPosted on 2009-02-03 at 21:47:05ID: 23545289

Thanks for the script. I thin it is hidden in one of those tasks that are running...

I will let you know what IO find out..

 

by: itilitiPosted on 2009-02-05 at 08:20:30ID: 23560869

It is the licensing engine. It disables is disabling the logins, because it has no CALs installed....

 

by: MattShadboltPosted on 2009-02-05 at 14:23:06ID: 23564992

But you don't need to install CALs in 2008... there isn't even a way to install them. How did you?

 

by: itilitiPosted on 2009-02-05 at 14:43:04ID: 23565165

I am using EBS. THere is definitely a place to install  the CALS on it...

 

by: MattShadboltPosted on 2009-02-05 at 14:46:21ID: 23565202

I'm using EBS as well, but I've removed the EBS console and the System Centre Essentials... Where did you install them to?

 

by: MattShadboltPosted on 2009-02-05 at 17:57:29ID: 23566232

Alrighty - itilit, did installing the CALs and assigning them work for you?

I've worked out how to install the CALs and assign them without using the EBS Administrator Console (I didn't actually remove it, but after I removed SCE & Forefront it just doesn't open)

Firstly you need to run

%programfiles%\Windows Essential Business Server\Bin\InstallLicenses.exe which will allow you to install CAL packs.
Then you need to assign them to each user - only way I can find is to use PS. (Use http://technet.microsoft.com/en-us/library/dd252607.aspx to install the PS Snap-in)
Next use Set-Cal in powershell to set the Cal per user.

 

by: ptrastPosted on 2011-06-02 at 09:12:04ID: 35895546

I have a customer who upgraded from EBS to standard and had this issue. He other DC's so he shut that DC down since you cannot disable the "windows server solutions license management service" that causes this issue. Don't upgrade from EBS. Do clean full install. Always a best practice.

20120131-EE-VQP-002

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