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The kerberos client received a KRB_AP_ERR_MODIFIED error from the server

Dear experts

A few days ago I could not logon to our DC or windows 7 clients / our windows XP clients (yes we still have some) were unaffected. Following a reboot, the server resumed normal function - I am keen to avoid this happening again so i have started investigating

I have noticed the error around the time the problem started:-

The kerberos client received a KRB_AP_ERR_MODIFIED error from the server

within the event log of our DC

I checked the Microsoft forums and they have the following article

http://support.microsoft.com/kb/558115/en-gb

The server in question only has one  ip address

Looking deeper I saw another article suggesting that a password had been changed ....

I also noticed events of the following type

The processing of Group Policy failed. Windows could not authenticate to the Active Directory service on a domain controller. (LDAP Bind function call failed). Look in the details tab for error code and description.

 System

  - Provider

   [ Name]  Microsoft-Windows-GroupPolicy
   [ Guid]  {AEA1B4FA-97D1-45F2-A64C-4D69FFFD92C9}
 
   EventID 1006
 
   Version 0
 
   Level 2
 
   Task 0
 
   Opcode 1
 
   Keywords 0x8000000000000000
 
  - TimeCreated

   [ SystemTime]  2015-02-04T13:11:55.867050200Z
 
   EventRecordID 7893
 
  - Correlation

   [ ActivityID]  {3CCDA29C-3372-4544-89F4-BE95630A9B46}
 
  - Execution

   [ ProcessID]  988
   [ ThreadID]  2460
 
   Channel System
 


Ii would appreciate your input

Kind regards
0
robbie999
Asked:
robbie999
  • 2
1 Solution
 
Dan McFaddenSystems EngineerCommented:
What was the eventID of the "KRB_AP_ERR_MODIFIED?"    Was it event id 4?  If so, there is more detail in the KRB error event details.  It should tell you what machine needs to have it's Kerberos password reset.

The error you posted most likely is the result of the Kerberos error.  The details of that error are more important.

Similar problem resolution:  http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/Windows_Server_2008/Q_28597748.html

If its not event id 4, can you post the event id of the original Kerberos event?

Dan
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robbie999Author Commented:
Dan thanks for your post

I have actually found the fix myself

For the reference of other users - my 2012 r2 domain used to have a 2003 sbs DC

please see the hotfix below

https://support.microsoft.com/kb/2989971?wa=wsignin1.0
0
 
robbie999Author Commented:
I resolved the issue through my own research
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