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Article Number: 000056968

Dell Unity: Too many sessions for NTServer (Dell Correctable)

Summary: CIFS Users get the error "Network BIOS session limit exceeded" when trying to access CIFS share.

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Article Content

Symptoms

CIFS users get the below error when connecting to a CIFS share on a certain NAS server on the Unity array:
"Network BIOS session limit exceeded"

Cause

This is usually caused by client behavior where some users continue to setup CIFS sessions but never close them. If the session number reaches a certain limit, new sessions are rejected.

Resolution

Modify the parameter on the NAS server that is responsible for logging out idle users to a smaller value. This removes inactive sessions and resolve the issue.

Additional Information

Logs to observe in c4_safe_ktrace.log file:     
(Path: /EMC/C4Core/log/c4_safe_ktrace.log) 
2019/02/04-09:16:41.100975 0 7F7DD439B7xxx sade:SMB: 3:[######01xx.###.###########.com] N.1 identifier doesn't match expected value. 2019/02/04-09:16:43.357304 1.6M 7F7DD3AF97xxx sade:SMB: 3:[######01xx.###.###########.com] Increase param cifs.listBlocks (511 now, 129794 items) 2019/02/04-09:16:43.357313 8 7F7DD3AF9xxx sade:SMB: 3:[######01xx.###.###########.com] Too many sessions (129794) for NTServer ######01xx 2019/02/04-09:16:43.371605 14K 7F7DD4A1Dxx sade:SMB: 3:[######01xx.###.###########.com] Increase param cifs.listBlocks (511 now, 129794 items) 2019/02/04-09:16:43.371614 7 7F7DD4A1Dxxx sade:SMB: 3:[######01xx.###.###########.com] Too many sessions (129794) for NTServer ######01xx

 

You may also notice that the below log entry occurs several times almost flooding the log file.
Please make sure you look for these entries on the SP that owns the NAS server.

If all the above symptoms appear and the logs match, contact Dell Support and quote this KB number.

Article Properties

Affected Product

Dell EMC Unity Family

Product

Dell EMC Unity, Unity All Flash, Dell EMC Unity Family, Unity Hybrid flash, UnityVSA

Last Published Date

08 Dec 2022

Version

4

Article Type

Solution

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