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CONTAP-537927: s4u2self for the NULL user

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Issue

  • When Dynamic Access Control (DAC) is enabled and a client connects using NTLM, the system attempts to collect claims for the user via S4U2Self, regardless of the user involved. 
  • In environments primarily using NTLM, numerous NULL user attempts are common, such as when applications running as "system authority" try to access shares on the storage controller. 
  • Failures in S4U2Self are logged in EMS due to limitations. 
  • Consequently, customers using both DAC and NTLM may see many secd.krb.s4u2self entries in EMS logs.

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