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CIFS authentication fails during tkeover due to DNS communication failure on node-02

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fas-systems
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nas
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Applies to

  • ONTAP 9
  • CIFS

Issue

  • After controller takeover from node-01 to node02, CIFS authentication fails on node-02 due to inability to communicate with DNS server
  • This results in CIFS service disruption
Example:
9/1/2025 08:54:09 node-02 ERROR secd.cifsAuth.problem: vserver (svm1) General CIFS authentication problem. Error: User authentication procedure failed
CIFS SMB2 Share mapping - ClientIp=10.xxx.xxx.xxx
[0ms] Login attempt by domain user 'DOMAIN\User1' using NTLMv2 style security
[2006] Failed to connect to 10.xxx.xxx.xxx for DNS via Source Address 192.xxx.xxx.xxx: Operation timed out
[3013] FAILURE: Unable to contact DNS to discover domain controllers.
[3014] Unable to make a connection (NetLogon: DOMAIN.COM), Result: RESULT_ERROR_DNS_CANT_REACH_SERVER
[3015] CIFS authentication failed
 
ERROR secd.dns.server.timed.out: DNS server 10.xxx.xxx.xxx did not respond to vserver=svm1 within timeout interval.
ERROR secd.dns.srv.lookup.failed: DNS server failed to lookup service (_ldap._tcp.dc._msdcs.DOMAIN.COM) for vserver (svm1) with error (Operation timed out).

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