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Intermittent disconnections between VM servers and storage system

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Applies to

  • A400
  • ONTAP 9.15.1P8
  • CIFS
  • SamSung VDI SmartCloud
  • IIS

Issue

  • Intermittent disconnections between VM servers and their NetApp storage system
  • The issue resulting in VDI portal servers experiencing IIS 500 error
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  • Windows Events
Error    8/25/2025 5:34:40 PM    Microsoft-Windows-SMBClient    30803    None    "The network connection could not be established."
 
Error: {Device Timeout}
The I/O operation at %hs failed to complete before the time-out period expired.
Server name: server1
Server address: ip_address:445
Instance name: \Device\LanmanRedirector
Connection type: Wsk
  • There are no CIFS related errors from EMS and Secd log
  • No high latency on workload
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