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SMB share slow to load because DC does not accept RC4 encryption

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Category:
ontap-9
Specialty:
nas
Last Updated:

Applies to

  • ONTAP 9
  • CIFS/SMB
  • Kerberos encryption

Issue

  • When Windows File Explorer navigates into an SMB share, there is a long delay before the share contents are displayed
  • Packet trace between ONTAP and the domain controller shows that 
    • ONTAP sends a Kerberos TGS-REQ with an RC4-encrypted ticket to the DC
    • The DC sends an empty 4-byte packet
    • ONTAP RSTs the TCP stream
  • EMS contains
    • secd.nfsAuth.noNameMap
    • Nblade_CifsOperationTimedOut_1
    • secd.nfsAuth.noUnixCreds 
    • secd.ldap.conn.waitTimeout
    • secd.ldap.query.timed.out 
  • SECD contains
    • KRB5_KDC_UNREACH
    • secd_rpc_auth_extended(caller: NBLADE_CIFS) with request ID:24244 which sat in the queue for 25 seconds.
  • RC4 is enabled on SMB and/or domain tunnel SVM(s) 
    • ::> cifs security show -advertised-enc-types RC4 -fields advertised-enc-types
vserver   advertised-enc-types
--------- -----------------------
svm1      aes-256,aes-128,rc4,des

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