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Windows clients sporadically freeze due to ungraceful disconnects

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ontap-9
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nas
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Applies to

  • ONTAP 9
  • SMB/CIFS
  • Windows Server 2019 instances (AWS AMI 10.0.17763.7434)

Issue

  • On rare occasions, clients are disconnected from their session and freeze for at least 5 minutes which trigger Splunk health check alerts indicating that the "server is not responding" with underlying storage or network failures.
  • The freeze behavior consists of CPU idle, no new RDP/WinRM connections, and all SMB activity hangs indefinitely.

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