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Many TCP Resets on port 2049 after ONTAP upgrade

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ontap-9
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nas
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Applies to

  • ONTAP 9
  • NFS Implementation prior to 9.5

Issue

  • EMS shows many Nblade.nfsConnResetAndClose event after upgrading  ONTAP to 9.11.1 or a later version
Nblade.nfsConnResetAndClose: Shutting down connection with the client. Vserver ID is 3; network data
protocol is NFS, Rpc Xid 0x0; client IP address:port is 192.168.4.5:57415. local IP address is 192.168.5.5; reason is Idle
Timeout, closing connection.
  • The NFS server option allow-idle-connection-timeout or allow-idle-connection is enabled after the upgrade. It was disabled before

cluster::*> nfs show -vserver svm1 -fields allow-idle-connection 
vserver allow-idle-connection-timeout 
------- --------------------- 
 svm1   enabled  

  • The NFSv4.1 implementation ID shows an ONTAP version before ONTAP 9.5.   

cluster::> set advanced
 
Warning: These advanced commands are potentially dangerous; use them only when directed to do so by NetApp personnel.
 
Do you want to continue? {y|n}: y
 
cluster::*> nfs show -vserver svm1 -fields v4.1-implementation-name
 
vserver v4.1-implementation-name
 
------- ------------------------
 
svm1   NetApp Release 9.4P3 

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