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All Cifs sessions on a TCP stream are reset after an session logoff on one cifs session

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Applies to

  • ONTAP 9
  • CIFS

Issue

  • Random files fail to Intermittently open when antimalware software is present
  • All CIFS sessions on a TCP stream are reset after a session logoff on one CIFS session
  • It results in client reconnecting, loss of access to the share, or other unexpected results depending upon the application and client OS
  • Packet trace shows multiple CIFS sessions on the same TCP stream
    • Session logoff on one SMB session
    • TCP RST,ACK (which kills all CIFS sessions on the stream)

73 2021-03-08 09:14:46.524896 0.000428 10.128.xx.xx 10.128.xx.xx 528 62107 445 SMB2 7 Session Setup Request, NTLMSSP_AUTH, User: \
74 2021-03-08 09:14:46.525837 0.000941 10.128.xx.xx 10.128.xx.xx 91 445 62107 SMB2 7 Session Setup Response
75 2021-03-08 09:14:46.526430 0.000593 10.128.xx.xx 10.128.xx.xx 0 62107 445 TCP 7 62107 → 445 [RST, ACK] Seq=4007904579 Ack=844321159 Win=0 Len=0

 

 

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