Scenario 1: Duplicated SPN In the case of a duplicated SPN, the same SPN was registered on at least two accounts. Encryption could not be enabled. Log Name: System Source: Microsoft-Windows-Security-Kerberos Date: 10/13/2011 10:10:05 PM Event ID: 4 Task Category: None Level: Error Keywords: Classic User: N/A Computer: IIS02.test.com Description: The Kerberos client received a KRB_AP_ERR_MODIFIED error Problems Authenticating as root If authentication fails when you try to become superuser on your system and you have already added the root principal to your host's keytab file, there are his comment is here
The code is wrapped as a tomcat servlet. Your password is not a good choice for a password. Solution: Make sure that the messages are being sent across the network correctly. Thank you for your work - it has been extremely useful!
The text portion of error messages differ on Windows-based Active Directory servers and UNIX KDCs, but all are based on the same set of error codes defined in RFC 1510, “The These is no need to duplicate those. I hope that you have enjoyed learning how to troubleshoot Kerberos authentication using network trace analysis to help find the cause of the failures. - Robert "The SPN Doctor" Greene Back
Authentication negotiation has failed, which is required for encryption. Usually, a principal with /admin as part of its name has the appropriate privileges. The master key is located in /var/krb5/.k5.REALM. Krb_ap_err_modified Spn Windows event log entries often contain Kerberos failure codes (for an example, please see security event 676).
Now we have seen what it looks like when there is no Service Principal Name defined, and when the Service Principal Name is not unique in the forest. Kerberos Error Codes Hi All,I have configure CRS2008 to using AD and Kerberos with Java application servers. Since the creation of RFC 1510, a small number of additional error codes have been proposed. Request is a replay Cause: The request has already been sent to this server and processed.
If you map these to more accounts/servers or do not map those correctly you get the error. Krb-error (30) which has a default maximum message size 65535 bytes. Illegal cross-realm ticket Cause: The ticket sent did not have the correct cross-realms. Converting Game of Life images to lists When is it okay to exceed the absolute maximum rating on a part?
Then, when client provide that ticket to the service for authentication, the service can’t decrypt it and authentication failed with KRB_AP_ERR_MODIFED. If the server name is not fully qualified, and the target domain (TEST.COM) is different from the client domain (TEST.COM), check if there are identically named server accounts in these two Krb_ap_err_modified Error From The Server This problem might also occur if your server has multiple Ethernet interfaces, and you have set up DNS to use a “name per interface” scheme instead of a “multiple address records Http Unauthorized Received On Kerberos Initialization Field is too long for this implementation Cause: The message size that was being sent by a Kerberized application was too long.
Cannot resolve KDC for requested realm Cause: Kerberos cannot determine any KDC for the realm. Requested principal and ticket don't match Cause: The service principal that you are connecting to and the service ticket that you have do not match. Problems Mounting a Kerberized NFS File System If mounting a Kerberized NFS file system fails, make sure that the /var/rcache/root file exists on the NFS server. Bad krb5 admin server hostname while initializing kadmin interface Cause: An invalid host name is configured for admin_server in the krb5.conf file. Krb5krb_ap_err_modified
I'm binding to the AD using NTLM authentication. The machine then requests and gets a Service Ticket for http/webapp.fabrikam.com (frames 17 & 18). Solution: Make sure that the correct host name for the master KDC is specified on the admin_server line in the krb5.conf file. Error message in Internet Explorer when you try to access a Web site that requires Kerberos authentication on a Windows XP-based computer: "HTTP Error 401 - Unauthorized: Access is denied due
Remove and obtain a new TGT using kinit, if necessary. Kdc_err_badoption Duplicate DNS entriesMost of the configurations gives the KRB_AP_ERR_MODIFIED error because of old DNS entries on your DNS server are not removed. Comments This is the default scenario for IIS 7+ when using IIS server’s computer name to access the web application.
SetSPN http://technet.microsoft.com/en-us/library/cc731241(WS.10).aspx Find duplicated SPN using ldifde For Windows 2003 and XP, we can use another tool named ldifde to search duplicated SPN. Who is the highest-grossing debut director? Solution: You must type the principal and policy names in the Name field to work on them, or you need to log in with a principal that has the appropriate privileges. Krb5kdc_err_preauth_required This RFC defines error codes in the number range of 1–61 (hex values 0x01 to 0x3D) and is available at http://www.ietf.org/rfc/rfc1510.txt.
Solution: Start authentication debugging by invoking the telnet command with the toggle encdebug command and look at the debug messages for further clues. Make sure that the target host has a keytab file with the correct version of the service key. I don't know if this is relevant. –Dieter Hubau Jan 9 '14 at 8:58 add a comment| 1 Answer 1 active oldest votes up vote 4 down vote Uppercase of the We will not go into much detail on most of the network trace data since this has already been covered.
Solution: Check that the cache location provided is correct. Also, make sure time synchronization between DCs is working well. Cross-realm in a forest not a problem with JGSS. For IIS 7+, we have 3 Windows authentication configuration.
KDC_ERR_SERVICE_REVOKED 0x13 19 Credentials for server have been revoked KDC_ERR_TGT_REVOKED 0x14 20 TGT has been revoked KDC_ERR_CLIENT_NOTYET 0x15 21 Client not yet valid - try again later KDC_ERR_SERVICE_NOTYET Solution: If the password are not synchronized, then you must specify a different password to complete Kerberos authentication. First, make sure that the root principal in the keytab file has a fully qualified host name as its instance. The machine then goes back to the web server and attempts to authenticate to the http://webapp.fabrikam.com/webapp site using the Kerberos ticket that it just got from the domain controller (frames 19-22).
Master key does not match database Cause: The loaded database dump was not created from a database that contains the master key. Solution: Make sure that you specified the correct host name for the master KDC. http://technet.microsoft.com/en-us/library/dd197434(WS.10).aspx 4. Solution: The user should run kinit before trying to start the service.
Solution: Make sure that you are using kinit with the correct options. Solution: Add the host's service principal to the host's keytab file. Solution: If you are using a Kerberized application that was developed by your site or a vendor, make sure that it is using Kerberos correctly. Operation requires “privilege” privilege Cause: The admin principal that was being used does not have the appropriate privilege configured in the kadm5.acl file.
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