Skip to main content
NetApp Knowledge Base

CIFS outage due to Kerberos error KRB5KRB_AP_ERR_MODIFIED

  1. Last updated
    Jul 29, 2024
  2. Save as PDF
Views:
1,617
Visibility:
Public
Votes:
0
Category:
ontap-9
Specialty:
nas
Last Updated:
7/29/2024, 7:12:22 AM

Applies to

  • ONTAP 9
  • Kerberos

Issue

  • CIFS clients cannot authenticate
  • ONTAP attempts to authenticate to the Domain Controller and receives Kerberos error KRB5KRB_AP_ERR_MODIFIED.
  • EMS says
    • 7/14/2023 14:14:14  cluster1node2   ERROR         secd.cifsAuth.problem: vserver (svm_name) General CIFS authentication problem. Error: User authentication procedure failed
      CIFS SMB2 Share mapping - Client Ip = 10.22.222.22
        [  0 ms] Login attempt by domain user 'DOMAIN\user_name' using NTLMv2 style security
        [   229] Successfully connected to ip 10.194.157.15, port 445 using TCP
        [   699] Encountered NT error (NT_STATUS_MORE_PROCESSING_REQUIRED) for SMB command SessionSetup
        [   699] Message stream modified (KRB5KRB_AP_ERR_MODIFIED)
        [   699] Kerberos authentication failed with result: 7541.
        [   699] Unable to connect to NetLogon service on dc_name.DOMAIN.com (Error: RESULT_ERROR_SECD_NO_CONNECTIONS_AVAILABLE)
        [   700] No servers available for MS_NETLOGON, vserver: 27, domain: DOMAIN.com.
      **[   700] FAILURE: Unable to make a connection (NetLogon:DOMAIN.COM), result: 6940
        [   700] CIFS authentication failed

 

Sign in to view the entire content of this KB article.

New to NetApp?

Learn more about our award-winning Support

NetApp provides no representations or warranties regarding the accuracy or reliability or serviceability of any information or recommendations provided in this publication or with respect to any results that may be obtained by the use of the information or observance of any recommendations provided herein. The information in this document is distributed AS IS and the use of this information or the implementation of any recommendations or techniques herein is a customer's responsibility and depends on the customer's ability to evaluate and integrate them into the customer's operational environment. This document and the information contained herein may be used solely in connection with the NetApp products discussed in this document.