topic Re: Can ssh but cannot telnet in Operating System - HP-UX

Can ssh but cannot telnet

mohdamir — Thu, 12 Mar 2009 03:10:30 GMT

Hi Gurus,
I have a problem where one of my servers can ssh but cannot telnet. I've checked the /etc/inetd.conf and /etc/services but found nothing unusual. Hope you guys can help.

TQ

Re: Can ssh but cannot telnet

mohdamir — Thu, 12 Mar 2009 03:12:00 GMT

/etc/services file

Re: Can ssh but cannot telnet

Jeeshan — Thu, 12 Mar 2009 03:40:24 GMT

do some check

1. Apply command "inetd -c" and try to telnet.
2. If not, try to telnet from localhost.
#telnet localhost 23

Re: Can ssh but cannot telnet

HejALL — Thu, 12 Mar 2009 04:41:52 GMT

Check in /etc/services what is your telnet port.
Then do
#telnet localhost
if successful then try to to do telnet to the same port from another server. If not successful then check with network team if the port is blocked or not.
But must the protocol is enable in /etc/inetd.conf.
try restarting inetd inetd -c

Re: Can ssh but cannot telnet

mohdamir — Thu, 12 Mar 2009 05:02:01 GMT

This is what it come out when I execute telnet localhost.

root[/] # telnet 127.0.0.1
Trying...
Connected to 127.0.0.1.
Escape character is '^]'.
telnetd: Telnet device drivers missing: No such device
Local flow control off
Connection closed by foreign host.
root[/] # telnet 127.0.0.1 23
Trying...
Connected to 127.0.0.1.
Escape character is '^]'.
telnetd: Telnet device drivers missing: No such device
Connection closed by foreign host.

Re: Can ssh but cannot telnet

Johnson Punniyalingam — Thu, 12 Mar 2009 05:15:26 GMT

Hi Mohdamir,

Do you have any session with root user?

If so,

# cd /
# rm /dev/pty/*
# rm /dev/pts/*
# insf -e
# cd /dev
# insf -d telm
# insf -d tels

Else try to login with single user mode and do the above.

Rgds,
Johnson,

Re: Can ssh but cannot telnet

Jeeshan — Thu, 12 Mar 2009 05:24:39 GMT

>>telnetd: Telnet device drivers missing: No such device

The pseudo terminal device files have been corrupted or some are missing. Do this:

rm /dev/pts/*
rm /dev/pty/*
cd /dev
insf -e
insf -d telm
insf -d tels

Re: Can ssh but cannot telnet

mohdamir — Thu, 12 Mar 2009 05:30:34 GMT

Wala.. Thanks guys! (^_^)

Re: Can ssh but cannot telnet

mohdamir — Thu, 12 Mar 2009 05:31:59 GMT

Thanks guys..