topic Re: telnet session in Operating System - HP-UX

telnet session

Ho, KK — Mon, 24 Feb 2003 07:07:05 GMT

Dear All
My HP-UX B.10.01 can not establish a telnet/ftp session in from other system, but it can make a telnet/ftp session out. I had already restarted inetd too and the output of netstat -an as follows:
....
tcp 0 0 *.23 *.* listen
tcp 0 0 *.21 *.* listen
.....
and inetd.sec contains the following entries:
....
spc allow 127.0.0.1
mserve allow 127.0.0.1
.....
and no host.allow or host.deny file under /etc

Re: telnet session

Ravi_8 — Mon, 24 Feb 2003 07:23:24 GMT

Hi.

#/usr/sbin/inetd

Re: telnet session

Ho, KK — Mon, 24 Feb 2003 08:19:18 GMT

The problem is still existed althrough start the daemon /usr/sbin/inetd again

Re: telnet session

Robin Wakefield — Mon, 24 Feb 2003 08:36:28 GMT

Can you try toggling the logging by typing:

inetd -l

and see if anything is displayed when you try and connect.

rgds, Robin

Re: telnet session

Mohamed_14 — Mon, 24 Feb 2003 08:49:24 GMT

Hi

check your routing table ,sometimes a corrupted routine table can give problems like this .
#netstat -r
#/usr/sbin/initd stop
#route -f
#/usr/sbin/initd start

stop inetd flush your routine table and restart inetd.

live free or die

Re: telnet session

Mohamed_14 — Mon, 24 Feb 2003 08:51:10 GMT

Hi

sorry inetd not initd /usr/sbin/inetd

sorry again

Re: telnet session

T G Manikandan — Mon, 24 Feb 2003 09:16:27 GMT

Possible reasons could be like

1.inetd not running.if inetd is running is telnet and ftp lines inside the /etc/inetd.con file enabled and not commented.You should do a inetd -c to re-read the configuration file for changes.

2.Duplicate ip-address on the network.

What messages are you getting while doing a telnet

Also check your /var/adm/syslog/syslog.log file for any hint.

Thanks

Re: telnet session

Jose Mosquera — Mon, 24 Feb 2003 09:31:04 GMT

Hi,

Have you checked some "telnet allow|deny" definition in the /var/adm/inetd.sec?

To more info "man inetd.sec"

Rgds.

Re: telnet session

Ron Kinner — Mon, 24 Feb 2003 21:42:15 GMT

What happens if you try to telnet to yourself?

Ron

Re: telnet session

Ho, KK — Tue, 25 Feb 2003 03:16:25 GMT

Dear All

All the above methods I had already tried, however the error still existed.

But most interesting thing that I can telnet itself by using localhost.

Re: telnet session

Jeff Schussele — Tue, 25 Feb 2003 03:21:57 GMT

Name resolution?
I've seen localhost defined to A host in DNS before.
Look at resolution order in nsswitch.conf & then pursue it in that order.

Rgds,
Jeff (It's usually basic)

Re: telnet session

Ron Kinner — Tue, 25 Feb 2003 16:04:16 GMT

Does it make any difference if you telnet to the ip address rather than the hostname?

Ron

Re: telnet session

Alex Lavrov — Tue, 25 Feb 2003 18:34:21 GMT

Hi, I had something like this
in hpux 11.11 (superdome).

I think, when you telnet your system, it tried to resolve your hostname and just times out with DNS.

You should try these 2 things (helped in my case):

1. route add
2. look in your /etc/nsswitch.conf file (create it if needed) and disable dns resolving

I think it should help.

Re: telnet session

pap — Tue, 25 Feb 2003 19:17:57 GMT

Hi ,
What exact error messages you are getting when you try to telnet your machine from another machine.? Please post that message.

Also. check your /var/adm/inetd.sec file, it must be the culprit of this problem in most of the cases. If any entry for particular IP ranges then please remove them and restart inetd using "inetd -c" command.

Thanks,

-pap

Re: telnet session

Ho, KK — Wed, 26 Feb 2003 08:35:26 GMT

Dear All
The telnet output message from the same subnet host ip address 172.22.61.80 is

#telnet 172.22.61.81
Trying ...
telnet: Unable to connect to remote host: Connection timed out
#

#ping 172.22.61.81
64 bytes from 172.22.61.81: icmp_seq=0. time=0.ms
64 bytes from 172.22.61.81: icmp_seq=0. time=0.ms
64 bytes from 172.22.61.81: icmp_seq=0. time=0.ms
#

and inetd.sec contains the following entries:
....
spc allow 127.0.0.1
mserve allow 127.0.0.1
.....

also no host.allow or host.deny file under /etc

thanks

Re: telnet session

Ron Kinner — Wed, 26 Feb 2003 14:45:36 GMT

Just for fun add telnet and ftp to inetd.sec or just rename the file to something else so it can't find it.

Ron