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Kerberos Client Received A Krb_ap_err_modified Error From

on a client's server the other day and I finally decided I would look at and resolve one of the more common error messages I see when I'm working on a remediation project:

This Indicates That The Target Server Failed To Decrypt The Ticket Provided By The Client

The Kerberos client received a KRB_AP_ERR_MODIFIED error from the server reception-win7$. The target name used the kerberos client received a krb_ap_err_modified error from the server domain controller was cifs/ceo-computer.domain.local. This indicates that the target server failed to decrypt the ticket provided by the client. This can occur when

The Kerberos Client Received A Krb_ap_err_tkt_nyv Error From The Server Host

the target server principal name (SPN) is registered on an account other than the account the target service is using. The message evaded me for quite a long time - it seemed to indicate a mismatch the kerberos client received a krb_ap_err_modified domain controller in computer names, but I knew quite well both were properly joined to the domain. I wondered what would happen if I tried a basic operation on the target machine? C:\System>dir \\ceo-computer\c$ Logon Failure: The target account name is incorrect. Interesting - something was going on with the account for ceo-computer$ I wonder if the machine is online and resolves to an IP address? C:\System>ping -n 1 ceo-computer Pinging ceo-computer.domain.local [10.0.0.36] with resetting the secure channel pw of a broken domain controller 32 bytes of data: Reply from 10.0.0.36: bytes=32 time<1ms TTL=128 Interesting - the machine is online. I wonder if they mean the computer account? A quick check would show me the NetBIOS machine name of that host: C:\System>nbtstat -A 10.0.0.36 Local Area Connection: Node IpAddress: [10.0.0.2] Scope Id: [] NetBIOS Remote Machine Name Table Name Type Status ------------------------------ RECEPTION-WIN7 <00> UNIQUE Registered DOMAIN      <00> GROUP Registered RECEPTION-WIN7 <20> UNIQUE Registered DOMAIN      <1E> GROUP Registered MAC Address = 00-0F-FB-F3-CF-73 And there we have it. When I issue the DIR command for the above UNC, it looks up the SPN for that machine and then looks the machine name up in DNS. The machine returned the IP address for a different computer, with the destination rejecting the connection because the login account for that computer was incorrect. A quick check showed what I immediately suspected - DHCP was not updating DNS when an DHCP Renew request was processed and was using (very) old values. I fixed DHCP and checked later - viola! - the problem was resolved. This entry was posted in Uncategorized on March 28, 2013 by wpadmin. Post navigation Server Manager Never Loads → 6 thoughts on “Log Message: Kerberos client received a KRB_AP_ERR_MODIFIED error from the server

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The Target Name Used Was Cifs

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Reset Secure Channel Password Domain Controller

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Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About http://serverfault.com/questions/646840/kerberos-event-4-servername-showing-username Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Server Fault Questions Tags Users Badges Unanswered Ask Question _ Server Fault is a question https://jespermchristensen.wordpress.com/2008/06/12/troubleshooting-the-kerberos-error-krb_ap_err_modified/ and answer site for system and network administrators. 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 kerberos client voted up and rise to the top Kerberos Event 4 servername showing username up vote 0 down vote favorite We have a .Net Windows Service that uses a Httplistener and authenticates requests using Kerberos. When users are connecting via their browser, an error in the users event log shows a Kerberos Event ID 4: The Kerberos client received a KRB_AP_ERR_MODIFIED error from the server $username$. The target name kerberos client received used was HTTP/$servername$.$domain$.com.au. This indicates that the target server failed to decrypt the ticket provided by the client. This can occur when the target server principal name (SPN) is registered on an account other than the account the target service is using. Ensure that the target SPN is only registered on the account used by the server. 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. Ensure that the service on the server and the KDC are both configured to use the same password. If the server name is not fully qualified, and the target domain ($domain$.COM.AU) is different from the client domain ($domain$.COM.AU), check if there are identically named server accounts in these two domains, or use the fully-qualified name to identify the server. For some reason the server that it is reporting is the user that is running the service. The first line: The Kerberos client received a KRB_AP_ERR_MODIFIED error from the server $username$. Every website (including Server Fault) has fixes for this error to do with SPN problems, but it always has a servername in the error. I can

Write the text yourself, as a copy-paste can give problems (I suspect the Unicode-formatting to be different on some webpages). Update: After this blog-entry I had an article published that gives an overview of Kerberos in a Sharepoint environment Update 23/12-2008: On Windows Server 2008 the IIS7 uses Kernel mode authentication and the kerberos tickets uses this and not the App. Pool identity. This causes KRB_AP_ERR_MODIFIED errors and the Kernel mode authentication must be switched off (check out this blog by Spence Harbar: http://www.harbar.net/archive/2008/05/18/Using-Kerberos-with-SharePoint-on-Windows-Server-2008.aspx) This article is about troubleshooting the specific error message and is mainly written for the Microsoft Sharepoint configuration. It can give some insight for other scenarios as well. 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 and days to troubleshoot this error message. Therefore I wrote this article to summarize the problem and possible solutions to the error. Overview of what to configure for the Kerberos Kerberos is the recommended authentication method in Sharepoint and we need to catch our breath and see through the confusing error messages that are popping up on our screen. First of all: It isn't really difficult to configure Kerberos if you know how to do it – and more important: how not to configure it wrong. If you just try to configure it and do not really know how it is supposed to be configured and why then you can get into trouble finding and undoing the bad configuration. We only need the following to be done Get a static IP address for all our servers and make sure the DNS zone (forward & reverse) do not have duplicate entries. Configure delegation trust for the Application Pool account, Frontend- and SQL servers Configure http Service Principal Na

 

kerberos client received a krb_ap_err_tkt_nyv error from the

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kerberos client received a krb_ap_err_modified error from the server this

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kerberos client recieved a krb_ap_err_modified error

Kerberos Client Recieved A Krb ap err modified Error p games PC games this indicates that the target server failed to decrypt the ticket provided by the client Windows games Windows phone games Entertainment All Entertainment the kerberos client received a krb ap err modified error from the server domain controller Movies TV Music Business Education Business Students educators p The Kerberos Client Received A Krb ap err tkt nyv Error From The Server Host p Developers Sale Sale Find a store Gift cards Products Software services Windows Office Free downloads security Internet p The Kerberos Client Received A Krb

kerberos client received a krb_ap_err_modified error from the server host

Kerberos Client Received A Krb ap err modified Error From The Server Host p Home Other VersionsLibraryForumsGallery Ask a question Quick access Forums home Browse forums users FAQ Search related threads Remove From My Forums p This Indicates That The Target Server Failed To Decrypt The Ticket Provided By The Client p Answered by The Kerberos client received a KRB AP ERR MODIFIED error the kerberos client received a krb ap err modified error from the server domain controller Windows Server Directory Services Question Sign in to vote Hi since one night the kerberos client received a krb ap err

kerberos client received a krb_ap_err_modified error from the server

Kerberos Client Received A Krb ap err modified Error From The Server p Home Other VersionsLibraryForumsGallery Ask a question Quick access Forums home Browse forums users FAQ Search related threads Remove From My Forums Answered by The Kerberos client received a KRB AP ERR MODIFIED error Windows Server Directory Services Question Sign in to vote Hi since one night this indicates that the target server failed to decrypt the ticket provided by the client i receive the following error message on all member Server in a branch office p The Kerberos Client Received A Krb ap err modified Error From

kerberos client received a krb_ap_err_modified error

Kerberos Client Received A Krb ap err modified Error p Home Other VersionsLibraryForumsGallery Ask a question Quick access Forums home Browse forums users FAQ Search related threads Remove From My Forums Answered by The Kerberos client received a KRB AP ERR MODIFIED error Windows Server Directory Services Question Sign in to vote Hi since one night this indicates that the target server failed to decrypt the ticket provided by the client i receive the following error message on all member Server in a branch office for p The Kerberos Client Received A Krb ap err modified Error From The Server