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SSH error when connecting over putty

 
Anshif
Occasional Contributor

SSH error when connecting over putty

Hi All,
Appreciate your quick help on this.
I am having issue while connecting to one of the server over ssh using putty. When i conncet to the server putty is getting disconnected with following message
"Server Unexpectedely closed network connection"
but after continuously tried for 2 or 3 times, i will be able to connect. I am facing this issue after restoring this server from ignite last week. before that this was working perfectly. Also i dont have any issue connecting to any of the other servers.
when i checked the syslog i found following error occuring continously.
###### truncated#### error: PAM: Authentication failed for cipher1 from###### truncated####

###### truncated#### Failed password for cipher1 from Failed password for cipher1 from

Can anyone help me on this?

Thanks in advance
6 REPLIES
bullz
Super Advisor

Re: SSH error when connecting over putty

Hello Anshif,

Login to server via telnet and porvide the log io /var/adm/syslog/syslog.log

we will be able to get some clue from it.

If possible try to restart SSH on it.
Tingli
Esteemed Contributor

Re: SSH error when connecting over putty

Take a look at /opt/ssh/etc/sshd_conf and compare it with other system to see whether there is any difference.
Anshif
Occasional Contributor

Re: SSH error when connecting over putty

Yes,
I compared it with othere servers. both are identical
Chandrahasa s
Valued Contributor

Re: SSH error when connecting over putty

Hi,

Convert your server to untrusted mode using sam
once then reconvert to trusted mode.

Type ssh -V and find ssh version you can download latest ssh from open ssh site repect of os version and install it hope this will resolver issue.

Chandra
Anshumali
Esteemed Contributor

Re: SSH error when connecting over putty

ssh -vvv Server IP might give some clue along with SSH debug on server side


To log at the DEBUG level, do the following:


# vi /opt/ssh/etc/sshd_config

# sftp-server logging
LogSftp yes
SftpLogFacility LOCAL1
SftpLogLevel DEBUG


# vi /etc/syslog.conf

local1.debug /var/adm/syslog/sshd.log


# kill -HUP


# /sbin/init.d/secsh stop


# /sbin/init.d/secsh start


Then all the logging will appear in /var/adm/syslog/sshd.log.


# ps -ef |grep ssh

Does the ssh to localhost has the issue all the time as well?
Dreams are not which you see while sleeping, Dreams are which doesnt allow you to sleep while you are chasing for them!!
Kapil Jha
Honored Contributor

Re: SSH error when connecting over putty

are you tryingt o connect through cipher1 server.

if not then cipher1 is accessing your server with wrong passwd >>> check that

Can you check ps -ef|grep ssh|wc

BR,
Kapil+
I am in this small bowl, I wane see the real world......