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Fpolicy fails to Register on 7-Mode CIFS with KRB5KRB_AP_ERR_MODIFIED due to CrowdStrike

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Category:
data-ontap-8
Specialty:
7dot
Last Updated:

Applies to

  • Data ONTAP 7-Mode
  • CrowdStrike
  • CIFS

Issue

  • Enabling Fpolicy causes latency on CIFS access, the following messages may be seen in etc/messages logs

[fpolicy:cifs.server.errorMsg:error]: CIFS: Error for
server \\<VSERVER>: Error while negotiating protocol with server STATUS_IO_TIMEOUT.
[fpolicy:fpolicy.fscreen.server.connectError:error]: FPOLICY: An attempt to connect to fpolicy server \\<VSERVER> for
policy varonis failed [0xc00000b5].

  • Packet traces show Fpolicy server reporting KRB5KRB_AP_ERR_MODIFIED in response to session setup
    • A Kerberos SMB2 Session Setup Request SMB2 that is encrypted with etype: eTYPE-ARCFOUR-HMAC-MD5 (23) fails with
      KRB Error: KRB5KRB_AP_ERR_MODIFIED

 

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