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SSH not running and will not restart

NigelP
Visitor

SSH not running and will not restart

I am suppose to have SSH running on an rp7400 server yet when I do a ps -ef and grep sshd it returns only the grep.  I then run /sbin/init.d/secsh start  it displays HP-UX Secure Shell started  run ps -ef and grep sshd it returns only the grep again.

 

any ideas would be much appriciated

12 REPLIES
Pete Randall
Outstanding Contributor

Re: SSH not running and will not restart

Anything in syslog or dmesg output that would give you a hint?  Check /etc/rc.log to make sure it came up initially, too.


Pete
Denver Osborn
Honored Contributor

Re: SSH not running and will not restart

You should also check the /etc/rc.config.d/sshd file.  Confirm that SSHD_START=1 in /etc/rc.config.d/sshd.  If it is set to 0, the secsh init script will not start sshd.

 

Using "sh -x" when you run the init script should give you a bit more detail to help you troubleshoot.

 

sh -x /sbin/init.d/secsh start

 

 

-denver

Steven E. Protter
Exalted Contributor

Re: SSH not running and will not restart

Shalom,

 

Most of the time when this happens to me (and it does) the sshd configuration file is the culprit.

 

If that is not the case a set -x near the top of the /sbin/init.d/secsh script will do the diagnosis.

 

If you reach the diagnosis stage post.

 

swlist -l product | egrep -i "secure|shell"

 

Post the swlist ouptut to see if secure shell is properly installed.

 

SEP

 

 

Steven E Protter
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com
NigelP
Visitor

Re: SSH not running and will not restart

Thanks Guys.

 

Looking at the syslog, when I have attempted to start ssh it has didplayed Error: Bind to port 22 on 0.0.0.0 failed: Address already in use.  fatal: cannot bind any address.

 

I then ran

 

aodxap03:syslog(222)# sh -x /sbin/init.d/secsh start

+ PATH=/usr/sbin:/usr/bin:/sbin:/usr/local/sbin:/usr/local/bin

+ export PATH

+ WHAT=HP-UX Secure Shell

+ WHAT_PATH=/opt/ssh/sbin/sshd

+ WHAT_PID=/var/run/sshd.pid

+ WHAT_CONFIG=/etc/rc.config.d/sshd

+ rval=0

+ [ -f /etc/rc.config.d/sshd ]

+ . /etc/rc.config.d/sshd

+ SSHD_START=1

+ SSHD_ARGS=

+ ps -ef

+ grep /opt/ssh/sbin/sshd

+ grep -v grep

+ 1> /dev/null

+ NOT_RUNNING=1

+ [ 1 -eq 1 -a -x /opt/ssh/sbin/sshd -a 1 -eq 1 ]

+ /opt/ssh/sbin/sshd

+ echo HP-UX Secure Shell started

HP-UX Secure Shell started

+ set_return

+ exit 0

followed by

 

aodxap03:syslog(223)# swlist -l product | egrep -i "secure|shel"

  Keyshell              B.11.11        Keyshell

  Secure_Shell          A.04.20.004    HP-UX Secure Shell

aodxap03:syslog(224)#

 

 

Pete Randall
Outstanding Contributor

Re: SSH not running and will not restart

From that output it looks like it might have started this time - at least I don't see any errors.  What does ps -ef  |grep ssh return?


Pete
NigelP
Visitor

Re: SSH not running and will not restart

| grep ssh just returns the grep

Patrick Wallek
Honored Contributor

Re: SSH not running and will not restart

Do you have lsof installed on the system?  If so, run 'lsof -i tcp:22' to see what process is accessing port 22.

Pete Randall
Outstanding Contributor

Re: SSH not running and will not restart

That, by the way, is a pretty old version of Secure Shell.  You might want to consider downloading the current offering (5.80.01):  https://h20392.www2.hp.com/portal/swdepot/try.do?productNumber=T1471AA&lang=EN&cc=EN&hpappid=PDAPI_SWD


Pete
NigelP
Visitor

Re: SSH not running and will not restart

yes I know it's an old version.  if it ain't broke don't fix it! but it may be time to look at upgrading ssh.

NigelP
Visitor

Re: SSH not running and will not restart

sorry I don't have isof installed and I will not be able to install it

Denver Osborn
Honored Contributor

Re: SSH not running and will not restart

lsof would really help to identify what (if any) process is listening on port 22... to at least confirm there is already listener preventing sshd from starting, you can use netstat:

 

netstat -an | awk '/22.*LISTEN/'

 

That won't show us what process is listening on the port... just that there is already a listener on that port.

 

You might try telnet to the port to see if it reports what might be running.

 

telnet localhost 22

 

If you see an "SSH-version" string returned when you telnet, then sshd is running.  Trying to start it again on the same port would result in the bind error message logged to the syslog.

 

Still wouldn't explain why you aren't seeing sshd with 'ps -ef |grep sshd'

 

Good luck,

-denver

Steven E. Protter
Exalted Contributor

Re: SSH not running and will not restart

Shalom,

openssh will update with a simple swinstall command. No need to swremove the old.

Leaving things alone like this is a great way to fail security audits.

People in our job need to be a little more proactive than that. There are major security wholes being found in openssh on a regular basis and this is one of those areas where you want to update periodically.

diag:
netstat -an | grep ":22 "

Please post.

swlist -l bundle | grep OE
# Just wondering what operating environment you are running.

SEP
Steven E Protter
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com