topic Re: ssh error in Operating System - HP-UX

ssh error

Sreer — Mon, 18 Jan 2010 20:37:42 GMT

Hi gurus,

I need to repair ssh function in my server box.

while doing ssh to my server iqm getting error:

ssh_exchange_identification connection closed by remote host

Could you pls help me on this?
unix version is 11.23

many thanks

rgds Sree

Re: ssh error

James R. Ferguson — Mon, 18 Jan 2010 20:43:25 GMT

Hi:

"Repair" suggests that something was once working. What happened to cause things to stop working?

Regards!

...JRF...

Re: ssh error

Steven Schweda — Mon, 18 Jan 2010 22:01:54 GMT

> [...] ssh to my server [...]

> unix version is 11.23

And "my server" is this "unix" system?
What's the other end? (Actual output from
"uname -a" would tell us more.)

Anything in the system log file?

Can you connect by SSH from "my server" to
itself?

Actual "ssh -v [...]" output?

Re: ssh error

johnsonpk — Tue, 19 Jan 2010 05:29:07 GMT

Hi Sree,

to trouble shoot the issue , run ssh in verbose mode

#ssh -vvv -l

alternatively you may rename known_hosts file under .ssh directory in your local machines's home.

rgds!
Johnson

Re: ssh error

Jupinder Bedi — Tue, 19 Jan 2010 05:57:14 GMT

i think your ssh proceess id died . try to login in to the server using telnet or from the console and restart your ssh services.

cd /sbin/init.d
./secsh start

Good luck

Re: ssh error

Horia Chirculescu — Tue, 19 Jan 2010 06:14:27 GMT

Hello,
This could also appear when somoeone played arround with TCP settings. Did you recently modified something on your server/client? Also, check your firewall. Of course, as sugested below, increasing the log verbosity usually helps understanding better what it is really going on. (On the client you must use -vvv as instructed, on the server side you can use LogLevel in the daemon config file -see man page)

Best regards,
Horia.

Re: ssh error

AVV — Tue, 19 Jan 2010 10:46:47 GMT

Hi Sree,

Check for the process and restart it if its not there already.

Re: ssh error

singh sanjeev — Tue, 19 Jan 2010 10:50:48 GMT

there may be chance of high resuoce utilization on the server ;try to find out via console. like swap,nproc etc...

Re: ssh error

Sreer — Tue, 19 Jan 2010 15:42:55 GMT

Hi,

I have restarted ssh.

/sbin/init.d/secsh stop then started

How can I confirm the ssh is already installed well?

/opt/ssh/etc]#swlist -l product | grep -i ssh
[root@server:/opt/ssh/etc]#

its not giving any info about the installed ssh.
I checked in a working server there also same out pu is getting ie, not giving any result from swlist command

Can u pls guide me on it?

thanks rgds Sree

Re: ssh error

OldSchool — Tue, 19 Jan 2010 15:55:49 GMT

Mnay unaswered question so far, as in:

a) "Repair" suggests that something was once working. As James notes, the implication is that this worked at one time. Did it?
b) What are you trying to ssh to? From?

Have you tried running "ssh -vvv" as noted and capture the log output?

Have you tried running a debugging instance of the sshd (possibly on a different port) to capture its log output?

Actual command issued?

As to swlist, if ssh wasn't installed via depot (ie built from source) then it won't show in the swlist.

How are you trying to autheticate? Passwordless (w/ keys)?

Re: ssh error

Horia Chirculescu — Wed, 20 Jan 2010 07:40:33 GMT

Hello,

>How can I confirm the ssh is already installed well?

You can try it by using "ssh -V" and in order to find out the location of the installed sshd, use which sshd and ll

Below a sample:

# which sshd
/usr/sbin/sshd
# ll /opt/ssh/sbin/
total 0
lrwxr-xr-x 1 root sys 29 Oct 7 2006 sshd -> /opt/ssh/PA-RISC2.0/sbin/sshd
# ll /usr/sbin/sshd
lrwxr-xr-x 1 root sys 18 Oct 7 2006 /usr/sbin/sshd -> /opt/ssh/sbin/sshd

Best regards,
Horia.