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SSH: The server has disconnected with an error. Too many authentication failures

SSH: The server has disconnected with an error. Too many authentication failures

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Jasper_R
New Contributor

‎06-13-2019 09:25 AM

Hi Guys,

I got the following error on two VSP 7200 switches. Got it solved on 1 switch by disabling and re-enabling SSH, but on the other switch, this doesn't work.

There are no active sessions, increasing the max-session allowed doesn't help, setting the timeout to 1 second to get "old" (there are none) session closed... But without any luck.

disabling rsa-auth did the trick on the last one, I could re-enable it after first ssh connections was successful.

Any one experience with this? Why does this happen?

Thanks!

Jasper
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M_Nees
Contributor III

‎07-30-2021 02:30 PM

Today we can fix the issue with the excellent GTAC support.

Root Cause are empty SSH key files.

 

Deleting them and bouncing SSH will fix the problem.

 

delete .ssh/ssh_rsa.key
    Are you sure (y/n) ? y
delete .ssh/ssh_dss.key
    Are you sure (y/n) ? y

conf t

(config)#no boot config flags sshd
(config)#
(config)#
(config)#no ssh
(config)#
(config)#
(config)#boot config flags sshd
(config)#
(config)#ssh

(config)#sh log file tail
************************************************************************************
                Command Execution Time: Fri Jul 30 16:13:47 2021 CEST
************************************************************************************
1 2021-07-30T16:13:46.994+02:00 XXXXXX CP1 - 0x000d8635 - 00000000 GlobalRouter SSH INFO SSH Host key generation is completed successfully
1 2021-07-30T16:13:40.391+02:00 XXXXXX CP1 - 0x000d8634 - 00000000 GlobalRouter SSH INFO SSH Host Key generation is in progress. SSH connections will not be processed till the key generation completes
1 2021-07-30T16:13:40.390+02:00 XXXXXX CP1 - 0x0000461f - 00000000 GlobalRouter SNMP INFO SSH server enabled
1 2021-07-30T16:13:40.390+02:00 XXXXXX CP1 - 0x000d861c - 00000000 GlobalRouter SSH INFO SSH Server Enabled

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Jasper_R
New Contributor

‎06-13-2019 09:39 AM

Also, XMC can't backup the switch when I re-enable the RSA-AUTH...
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GTM-P2G8KFN