Krb_ap_err_modified Error From The Server 1 The
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This Indicates That The Target Server Failed To Decrypt The Ticket Provided By The Client
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The Kerberos Client Received A Krb_ap_err_modified Error From The Server Domain Controller
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Krb_ap_err_modified Domain Controller
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Resetting The Secure Channel Pw Of A Broken Domain Controller
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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: The http://peter-kline.com/?p=1 Kerberos client received a KRB_AP_ERR_MODIFIED error from the server reception-win7$. The target name used was cifs/ceo-computer.domain.local. This indicates that the target server failed to decrypt the ticket provided by the client. This can occur when the target server principal name (SPN) is registered on an account other than the account the target service is using. The message evaded me for quite a long time - it seemed to indicate a mismatch in error from computer names, but I knew quite well both were properly joined to the domain. I wondered what would happen if I tried a basic operation on the target machine? C:\System>dir \\ceo-computer\c$ 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 32 bytes error from the 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 ” Michael August 6, 2