telnet: Unable to connect to remote host: Connection refused

[yangk]

Hi
I have encounted a problem with telnet on the HP-UX11.11.
And the /etc/hosts file as following:
16.157.129.222 sshpa3.chn.hp.com sshpa3
127.0.0.1 localhost loopback

When I use the command:

1.root@sshpa3# telnet sshpa3
Trying...
telnet: Unable to connect to remote host:Connection refused

and when I use the command :
root@sshpa3# telnet localhost
or
root@sshpa3# telnet 127.0.0.1
can login to the system.

so what is the problem?Thanks!
What's more the command "ping sshpa3 " can work well.

And "nslookup sshpa3.chn.hp.com":

looking up FILES
Name: sshpa3.chn.hp.com
Address: 16.157.129.222
Aliases: sshpa3

It can resolve the realm name.
so what is the problem?

Thanks!

[Ganesan R]

Hi,

What is output of #telnet 16.157.129.222 ?

Are you able to telnet using ip address?

[yangk]

When I use the command:

root@sshpa3# telnet 16.157.129.222

it can login to the system.
I think "telnet sshpa3 " and "telnet sshpa3.chn.hp.com" just the sshpa3 and sshpa3.chn.hp.com " can not resolve to the IP address 16.157.129.222.

But "nslookup sshpa3.chn.hp.com":

looking up FILES
Name: sshpa3.chn.hp.com
Address: 16.157.129.222
Aliases: sshpa3

[Matti_Kurkela]

Some sort of local filtering seems to be in effect.

Does the system have IPFilter installed?
If it has, the configuration is usually stored at /etc/opt/ipf.

Or maybe the system's network interface has been reconfigured without rebooting the system? In that case, running the command "inetd -c" might help.

MK

[Steven Schweda]

http://forums.itrc.hp.com/service/forums/questionanswer.do?threadId=1316915

[yangk]

Hi ,Matti Kurkela


But the ipf config file "ipf.conf and ipnat.conf" is empty.

and I do not modify inetd.conf file.
the telnet is listening on port 23.
tcp 0 0 *.23 *.* LISTEN

and in the inetd.conf file:
telnet stream tcp nowait root /usr/lbin/telnetd telnetd -b /etc/issue

[Ganesan R]

Hi,

Do you have /etc/hosts.allow and /etc/hosts.deny files in place ? If you have look into the files.

Just to make sure we have not blocked telnet services in inetd.sec, try connecting from remote machine using hostname and ip address.

[yangk]

Hi ,Ganesan R

In the folder /etc/, just have a hosts.equiv
file , but just have only one line :
sshpa4.chn.hp.com root

so I think there is nothing to do with the hosts.equiv file

And also there is no deny in the inetd.sec file.

[yangk]

I have found what is the reason of the problem. Thank you everyone.

[Ganesan R]

Hi,

Could you share your findings so that it will be useful for others when they come across the same issue?