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CONTAP-34034: Local user authentication fails if DNS or LDAP servers are unreachable

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Issue

  • CIFS users are not able to access CIFS shares.
  • CIFS is joined to domain and users are connecting using local user on vserver.
  • However, SECD logs indicate failure in connecting to LDAP server when client is accessing CIFS.
11/13/2023 18:07:37 BIG-NAS-05       ERROR         secd.dns.srv.lookup.failed: DNS server failed to look up service (_ldap._tcp.dc._msdcs.big.local) for vserver (DATA2) with error (Operation timed out).
11/13/2023 18:07:29 BIG-NAS-02       ERROR         secd.cifsAuth.problem: vserver (DATA1) General CIFS authentication problem. Error: User authentication procedure failed

CIFS SMB2 Share mapping - Client Ip = 192.168.13.103

  [  0 ms] Login attempt by domain user '2019-03-DEDI\Dedi.Wahyu' using NTLMv2 style security
  [  2002] TCP connection to ip 192.168.210.10, port 389 via interface 10.10.128.154 failed: Operation timed out.
  [  2002] LDAP search for the "dnsHostName" attribute(s) within base "" (scope: 0) using filter "(objectClass=*)" failed with error: Can't contact LDAP server
  [  4009] Failed to connect to 192.168.210.10 for DNS via Source Address 10.10.128.154: Operation timed out
**[  4009] FAILURE: Unable to contact DNS to discover domain controllers.
  [  4010] Unable to make a connection (NetLogon:BIG.LOCAL), result: 6812

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