Event Id 4 Security-kerberos Krb_ap_err_modified
x 101 Anonymous In our case, Symantec Backup Exec 2012 was attempting to discover servers that are not being backed up causing these Kerberos errors on our backup server event logs.The If the machine is not in same domain as the client reporting the error, verify that a duplicate computer does not exist in the local domain with the same name as You should keep it up forever! This error can also happen if the target service account password is different than what is configured on the Kerberos Key Distribution Center for that target service. http://smartphpstatistics.com/event-id/the-kerberos-client-received-a-krb-ap-err-modified-error-from-the-server-cifs.html
We appreciate your feedback. active-directory windows-server-2012-r2 kerberos share|improve this question edited May 6 '15 at 6:43 Andrew Schulman 5,17881835 asked May 6 '15 at 6:32 Timo77 2617 add a comment| 1 Answer 1 active oldest For the issue, it may be caused by the duplicate SPN. Not a member? https://technet.microsoft.com/en-us/library/cc733987(v=ws.10).aspx
Event Id 4 Krb_ap_err_modified Error
WINS was ok, however, reverse DNS had several entries for not only the mail virtual server on the cluster, but the other nodes as well due to previous setting of DHCP The target name used was SMTPSVC/servername.company.com. This indicates that the password used to encrypt the kerberos service ticket is different than that on the target server. x 309 Anonymous I had reinstalled a server but forgot to delete it from AD.
I have run a test in my lab to access a DFS path, see below example, in TGS request, the client try to get the service ticket of CIFS/test.local, in TGS Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the Please ensure that the target SPN is registered on, and only registered on, the account used by the server. Event Id 4 Security Kerberos Windows 7 Other cases can cause this error: ================================= 1) WINS / DNS misconfiguration: The name of the target server is mistakenly resolved to a different machine.
The client presents encrypted session ticket it received from the KDC to the target server. Ensure that the service on the server and the KDC are both configured to use the same password. Attempt to locate the machines and determine their domain affiliation and current IP address. https://social.technet.microsoft.com/Forums/office/en-US/12bbe120-d5a8-4751-adf4-10b90e7af840/securitykerberos-event-id-4-krbaperrmodified-for-dc-target-name-cifsdomain?forum=winserverDS This event will occur if you present a service ticket to a target server which cannot be decrypted by the target server.
We only started seeing problems about a week ago. Event Id 4 Exchange 2013 The target name used was E3514235-4B06-11D1-AB04-00C04FC2DCD2/d170f7fc-6f05-4ea5-9dee-a657e3de019b/[email protected] Privacy statement © 2016 Microsoft. While this is overkill on the scale of killing a mouse with a thermonuclear weapon, it pointed in the direction of a network level problem.
- Please remember to mark the replies as answers if they help and unmark them if they provide no help.
- Servers have DFS and IIS services installed.
- This indicates that the target server failed to decrypt the ticket provided by the client.
- For some reason the server that it is reporting is the user that is running the service.
- Removed the RPCSS/server024.domain.com and RPCSS/SERVER024 and HOST/SERVER024.domain.com and HOST/SERVER024spn's then rebooted the license server.
- If the server name is not fully qualified, and the target domain is different from the client domain, check if there are identically named server accounts in these two domains, or
- Creating your account only takes a few minutes.
- See example of private comment Links: IIS 6.0 Resource Kit, Troubleshooting Kerberos Errors Search: Google - Bing - Microsoft - Yahoo - EventID.Net Queue (0) - More links...
- I notice that clients that are having the problem are requesting cifs/domain.com Kerberos tickets, and clients that aren't having the problem, aren't requesting those tickets.
The Kerberos Client Received A Krb_ap_err_modified Error From The Server Cifs
So I didn't understand why these errors were suddenly popping up. https://community.spiceworks.com/topic/900539-event-id-4-kerberos-client-krb_ap_err_modified-error-on-domain-controller I ran into this error message in multiple Windows Sharepoint Services 3.0 (WSS) and Microsoft Office Sharepoint Server 2007 (MOSS) installations with different solutions to it and you can use hours Event Id 4 Krb_ap_err_modified Error Then client try to send the service ticket to target DC A, but DC A unable to use its computer password decrypt this ticket. Security Kerberos Event Id 4 Domain Controller Documentation on this setting is sparse, but it looks like it should be a unique name, like ADFS-admin.domain.com , so here's what I did to try to resolve this: - Ran
Logon to DC and open ADUC with Advanced Features View, 2. check my blog Ensure that the target SPN is only registered on the account used by the server. I'll try to explain our problem, hope this will be useful for others. I went through the event logs on each DC looking for any instances of the Event 11, and found none. Security-kerberos Event Id 4 Domain Controller 2008
And it's important that you move it (read: delete it from the computer account) and not just copy it. I have tried to collect as many sources to the problem that I could find and a solution to each one starting with the one that most likely could cause the First, I wanted to review a few of the details: I can confirm that the event I am seeing is appearing on the client side, as you described. http://smartphpstatistics.com/event-id/kerberos-error-message-event-id-3.html Look for multiple accounts in the domain with the name SRV1.
To fix verify the resolved IP address actually matches the target machine's IP address. 2) Service misconfiguration (server is actually running as DomainB\SomeOtherAccount, but the service transport, RPC, CIFS, ..., is Kerbtray.exe Windows 2008 R2 At the same time, in the event viewer of my systems I had the following error message : Log Name: System Source: Microsoft-Windows-Security-Kerberos Event ID: 4 Task Category: None Level: Error That's been part of our network design for many years now.
x 76 Stefan Suesser We had this problem on a newly installed DC that also acts as DHCP Server and was not properly configured.
However, it will not catch duplicates in different forests. x 10 Michael Papalabrou This problem has occurred after bringing up a new machine to replace an old one that failed, without first removing the old computer account from the domain. Go to Domain Controllers OU and right click on the DC's computer account that you retrieve from network tracing log， 3. This Indicates That The Target Server Failed To Decrypt The Ticket Provided By The Client. Also check the reverse lookup zone as the Kerberos use this lookup to make the server-match.
If you have feedback for TechNet Support, contact [email protected] Edited by Vivian_WangModerator Wednesday, December 24, 2014 2:08 AM Proposed as answer by Mahdi TehraniModerator Wednesday, December 24, 2014 3:12 AM Marked The Kerberos client received a KRB_AP_ERR_MODIFIED error from the server
If the client sent the ticket to the same target server that the KDC encrypted the ticket for, the target server can decrypt the ticket and everything works properly.