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Unable to connect CIFS share with error User is not known

Last Updated:

Applies to

  • ONTAP 9
  • Common Internet File System(CIFS)
  • SMB


  • All configuration include IP address keep the original configuration.
  • Some CIFS clients are not able to connect to CIFS shares.
  • Since the storage hardware was changed, the clients that encountered this CIFS share access problem have never restarted.
  • SecD error indicates error.
11/18/2021 11:19:05 node1 ERROR secd.cifsAuth.problem: vserver (NAS) General CIFS authentication problem. Error: User authentication procedure failed
CIFS SMB2 Share mapping - Client Ip = 192.xx.xx.xx
[ 0 ms] Login attempt by local user '.\username' using NTLMv2 style security
[ 0] User is not known
[ 0] Unable to find the NetBIOS domain name for Active Directory '.'
**[ 0] FAILURE: CIFS authentication failed
[ 0] Unable to find the NetBIOS domain name for Active Directory '.'

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