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Fatal: Read from socket failed: Connection reset by peer [preauth]


 
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# 1  
Old 06-02-2014
Fatal: Read from socket failed: Connection reset by peer [preauth]

Hello,
I have recently updated my AIX machine from version 6.1.7.5 to 6.1.9.1 and i noticed that the errpt of the server is full of ssh messages like the one below:
sshd[<process_id>]: fatal: Read from socket failed: Connection reset by peer [preauth]
Does anyone knows if this a known bug of the ssh version?

Thank you

Last edited by omonoiatis9; 06-02-2014 at 03:08 AM..
# 2  
Old 06-02-2014
No but the update affected ssh also you may now have obsolete keys... and need to generate / transfer new ones...
# 3  
Old 06-02-2014
hmm are you sure about that?
cause if this was the case then probably users would not been able to connect right? but it seems that they dont have any problem to connect.
by the way i noticed that this version of ssh uses also ecdsa key which didnt existed in previous version. so i generate this pair of keys because i was also fed with messages in errpt that ssh could not locate this key.
so i generate the key pair for ecdsa and then i get this new message repeating on errpt.
# 4  
Old 06-02-2014
The keys of the users ( remote hosts that is...) have not changed so there is no reason they would have connection issues, its this specific host connecting elsewhere if using private keys (e.g. fo no passwd connection ) that will be refused by remote because keys have changed and dont match with what the remote host has in its known_hosts file...
# 5  
Old 06-02-2014
so what you suggest is to:
1. generate new pair of keys
2. remove the entry of the host in the known_hosts file of remote server
3. connect from host to remote server to authenticate the host and save the new key to known_hosts file of remote server.
is that correct?
# 6  
Old 06-02-2014
If you know the remote host , try to ssh to it and see if it rejects you... If its the case remove from its known_hosts file the line concerning your host and try again
I normally note down the line number(say, 42) from the error message, and run
Code:
 vi +42 known_hosts

and delete offending key.

Code:
ssh-keygen  -R <hostname>

can be used
to remove all keys belonging to a hostname.

Last edited by vbe; 06-02-2014 at 10:26 AM.. Reason: added ssh-keygen...
# 7  
Old 06-02-2014
well actually it doesnt reject my connection but it asks for authentication. it doesnt connect me straight away.

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