Sun Storage 7000 Unified Storage System: sshd 'common cipher' messages clutter the log files. (Doc ID 1454433.1)

Last updated on AUGUST 16, 2012

Applies to:

Sun ZFS Storage 7120 - Version Not Applicable to Not Applicable [Release N/A]
Sun ZFS Storage 7320 - Version Not Applicable to Not Applicable [Release N/A]
Sun ZFS Storage 7420 - Version Not Applicable to Not Applicable [Release N/A]
Sun Storage 7110 Unified Storage System - Version Not Applicable to Not Applicable [Release N/A]
Sun Storage 7210 Unified Storage System - Version Not Applicable to Not Applicable [Release N/A]
Information in this document applies to any platform.
One might see many logs such as:

Apr 14 08:53:55 my-nas-box-1 sshd[8286]: [ID 800047 auth.crit] fatal: Client and server could not agree on a common cipher: client "aes128-cbc,twofish192-cbc,cast128-cbc,twofish256-cbc,twofish128-cbc,3des-cbc,blowfish-cbc,aes256-cbc,aes192-cbc", server "aes128-ctr,aes192-ctr,aes256-ctr,arcfour128,arcfour256,arcfour". The server cipher list can be controlled using the "Ciphers" option, see sshd_config(4) for more information.

among the logs in a Series 7000 NAS Appliance.

The reason for these logs is that there are sshd clients connecting to the 7000 box which are using old sshd ciphers.
Since 7000 boxes do not use old ciphers, a conflict arises and hence the logs. However, the logs are harmless despite their numbers.

Symptoms

One can see messages such as the following in the logs:

 Apr  14 08:53:55 my-nas-box-1 sshd[8286]: [ID 800047 auth.crit] fatal: Client and server could not agree on a common cipher: client "aes128-cbc,twofish192-cbc,cast128-cbc,twofish256-cbc,twofish128-cbc,3des-cbc,blowfish-cbc,aes256-cbc,aes192-cbc", server "aes128-ctr,aes192-ctr,aes256-ctr,arcfour128,arcfour256,arcfour". The server cipher list can be controlled using the "Ciphers" option, see sshd_config(4) for more information.

Cause

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