Windows event id 4 (kerberos)

Wed Jan 20 14:46:04 EST 2010

Re-joining all 3 computers is bit difficult. We get 3 to 4 more events per day and always BRAPRINT001 is common but rest two computer names are changed. If I try to do it in such a way I have to un-join many computers. The rest two computers are always winxp. 

I think if we understand the description very well, we can easily trouble shoot it. 

I generated Lsass.log and nemon captures but could not understand. Do you know any blog who could hlep by analyzing netmon captures?

However thanks for all your help you provided so far. 

________________________________
From: Christopher D. Clausen <cclausen at acm.org>
To: raj esh L <rrcrajesh2003 at yahoo.com>
Cc: kerberos at mit.edu
Sent: Wed, 20 January, 2010 22:53:11
Subject: Re: Windows event id 4 (kerberos)

I have no other suggestions.  I'd say to try re-joining all three 
computers, one at a time, and see if the errors go away.

The error basically means that the Kerberos "stuff" sent across the 
network could not be used by the client computer.  Again, this is 
usually due to two computer accounts with the same name and the wrong 
one being used for communication from some other computer.  It could 
also be that network errors caused packet corruption causing the message 
to be generated.

<<CDC

raj esh L <rrcrajesh2003 at yahoo.com> wrote:
> Thanks for your response.
>
> I have not tried to un-join & join. I can try this option as a last
> effort.
> If i need to un-join, Which machine do I need to do? Is BRAPRINT001?
> Time zones are correct on all servers.
> I queried all the dcs event logs for eventid 11 through
> eventcombat.exe but none of these SPNS found.
>
> As per the description, 3 server names (braprint001 where I get
> alerts and other two) are involved in this problem. I could not able
> to understand the description itself. Can you plz explain what it is?
> I captured netmon for it at the time of problem occurred. These all
> names are appearing over there. But I could not understand it.
>
> It's my humble request to verify those and make me understand.
>
>
>
>
> ________________________________
> From: Christopher D. Clausen <cclausen at acm.org>
> To: raj esh L <rrcrajesh2003 at yahoo.com>
> Cc: kerberos at mit.edu
> Sent: Wed, 20 January, 2010 21:15:13
> Subject: Re: Windows event id 4 (kerberos)
>
> The error list in netstat (as well as in the other email that you
> sent)
> seems reasonable for a machine that has been up for a period of time.
> Setspn output looks reasonable as well.
>
> Have you tried just un-joining and re-joining the computer account in
> question to the domain? This usually fixes the problem in my
> experience, assuming there isn't some actual underlying cause (like
> duplicated accounts.) You may need to delete and re-create the
> computer
> account after un-joining.
>
> Are the times and time zones correct on these systems? Do they
> regularly syncronize to the domain controller's time?
>
> Are there any errors in the event log on the domain controllers about
> duplicate computer accounts?
>
> Some of the suggestions here might be useful to you as well:
> http://eventid.net/display.asp?eventid=4&eventno=1968&source=Kerberos&phase=1
> http://eventid.net/display.asp?eventid=11&eventno=569&source=KDC&phase=1
>
> <<CDC
>
> raj esh L <rrcrajesh2003 at yahoo.com> wrote:
>> No samba and non-windows. All are windows servers.
>>
>>
>> U:\>setspn -l SLH-001155
>> Registered ServicePrincipalNames for
>> CN=SLH-001155,OU=Laptops,OU=SLH,OU=GBR,OU=E
>> UR,DC=dir,DC=ucb-group,DC=com:
>> HOST/SLH-001155
>> HOST/SLH-001155.dir.ucb-group.com
>>
>> U:\>setspn -l BRAPRINT001
>> Registered ServicePrincipalNames for
>> CN=BRAPRINT001,OU=Servers,OU=Global,OU=BEL,
>> OU=EUR,DC=dir,DC=ucb-group,DC=com:
>> HOST/BRAPRINT001
>> HOST/BRAPRINT001.dir.ucb-group.com
>>
>> U:\>setspn -l ATL017784
>> Registered ServicePrincipalNames for
>> CN=ATL017784,OU=Laptops,OU=ATL,OU=USA,OU=AM
>> E,DC=dir,DC=ucb-group,DC=com:
>> HOST/ATL017784
>> HOST/ATL017784.dir.ucb-group.com
>>
>> U:\>netstat -s
>> IPv4 Statistics
>> Received Header Errors = 0
>> Received Address Errors = 42563
>> Unknown Protocols Received = 0
>> Received Packets Discarded = 0
>> Routing Discards = 0
>> Discarded Output Packets = 0
>> Output Packet No Route = 0
>> Reassembly Failures = 0
>> Datagrams Failing Fragmentation = 0
>> ICMPv4 Statistics
>> Errors 0 13
>> TCP Statistics for IPv4
>> Failed Connection Attempts = 4275
>> Segments Retransmitted = 24512
>> UDP Statistics for IPv4
>> Receive Errors = 22753
>>
>>
>> Please let me know if any other information is required.
>>
>>
>>
>>
>> ________________________________
>> From: raj esh L <rrcrajesh2003 at yahoo.com>
>> To: Christopher D. Clausen <cclausen at acm.org>
>> Cc: kerberos at mit.edu
>> Sent: Wed, 20 January, 2010 3:47:11
>> Subject: Re: Windows event id 4 (kerberos)
>>
>>
>> Than Q very much for your information and would appreciate. But
>>
>> I verified SPNs and computer names - No duplication found.
>>
>> These computers not updated recently and exist from long time.
>>
>> Thanks once again about networking help .I would check and give you
>> update.
>>
>> i will give the setspn details also.
>>
>> I spent days together to search the fix but did not find a correct
>> solution. your help would be highly appreciable.
>>
>> we get the message on every day. But we see the same event id, same
>> description with different names 'SLH-001155' with different cifs\
>>
>> First of all, I do not understand clearly about the description. if
>> you would explain what is going here with examples of server names
>> based on description that would be great.
>>
>>
>> ________________________________
>> From: Christopher D. Clausen <cclausen at acm.org>
>> To: raj esh L <rrcrajesh2003 at yahoo.com>
>> Cc: kerberos at mit.edu
>> Sent: Wed, 20 January, 2010 3:01:30
>> Subject: Re: Windows event id 4 (kerberos)
>>
>> Is this for an actual Windows computer? Or a non-Windows machine
>> running something like Samba?
>>
>> -----
>>
>> I see these all the time. I believe these occur on occation when a
>> computer account automatically updates its machine account password
>> in Active Directory. (This is a normal function of a computer joined
>> to AD.)
>>
>> I'd suggest un-joining and re-joining the computer to the domain if
>> this
>> is a persistent problem on this system.
>>
>> If the issue persists you likely have a network connection problem.
>> Check netstat -s output and look for high error counts and check
>> duplex
>> settings on all ends of the connection.
>>
>> -----
>>
>> Another thing to check is for identially named accounts (as
>> mentioned,)
>> including SPNs that were set with setspn.exe or ktpass.exe. These are
>> hard to track down and may require specific LDAP queries to locate.
>>
>> -----
>>
>> Please send output of setspn -l SLH-001155
>>
>> <<CDC
>>
>> raj esh L <rrcrajesh2003 at yahoo.com> wrote:
>>> We have observed Kerberos event id4 on one member server (Print
>>> server )BRAPRINT001 (10.1.37.167). Please find the description below
>>> about the event id. Can some one please help me on it ?
>>>
>>> Event Type: Error
>>> Event Source: Kerberos
>>> Event Category: None
>>> Event ID: 4
>>> Date: 1/13/2010
>>> Time: 6:16:35 PM
>>> User: N/A
>>> Computer: BRAPRINT001
>>> Description:
>>> The kerberos client received a KRB_AP_ERR_MODIFIED error from the
>>> server SLH-001155$. The target name used was
>>> cifs/ATL017784.dir.ucb-group.com. This indicates that the password
>>> used to encrypt the kerberos service ticket is different than that
>>> on the target server. Commonly, this is due to identically named
>>> machine accounts in the target realm (DIR.UCB-GROUP.COM), and the
>>> client realm. Please contact your system administrator.
>>>
>>> For more information, see Help and Support Center at
>>> http://go.microsoft.com/fwlink/events.asp.
>>>
>>>
>>> ATL017784.dir.ucb-group.com [10.70.11.107]
>>>
>>> We captured network for it. Can you please help here what is going
>>> on?
>>>
>>>
>>> captured file is available at http://www.megaupload.com/?d=WDIG1CAT
>>>
>>>
>>>
>>> ________________________________________________
>>> Kerberos mailing list Kerberos at mit.edu
>>> https://mailman.mit.edu/mailman/listinfo/kerberos 