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

telnet connection

JUAN_91 — Fri, 02 Mar 2007 15:20:02 GMT

PLATFORM:
--------
Server:
RP3440 HP-UX 11.11
lan0 to router
lan1 ro router
Host:
PC running a telnet&ftp server. Reachable from other sites.

PROBLEM:
-From the server I can ping the host, but I can not telnet it, or ftp it.
-I can send snmp ping to the host too. It seems that tcp has problems but not udp.
-Traceroute to the PC is OK.
-How can I realize over wich lan ping/telnet/snmp are going?
-How can I realize if my server is blocking this protocols?

TIA&BR,

Juan.

Re: telnet connection

Marc Ahrendt — Fri, 02 Mar 2007 17:59:06 GMT

seems like you have tried access from the HP system. have you tried accessing the HP system from the PC using telnet and ftp? if so what results did you get?

Re: telnet connection

Steven E. Protter — Fri, 02 Mar 2007 18:00:25 GMT

Shalom Juan,

Try restarting the inetd daemon

inetd -k

inetd -c

There is good help on that one.

see /etc/inted.conf and make sure telnetd is configured to run.

SEP

Re: telnet connection

JUAN_91 — Thu, 08 Mar 2007 13:33:59 GMT

Hi Marc, it is not possible to perform a ftp/telnet/ping from PC to HP.
Hi Steven, I'll test it and let you know asap. TIA&BR,

Juan.

Re: telnet connection

Court Campbell — Thu, 08 Mar 2007 13:44:03 GMT

If I understand this correctly you are using the HP-UX box as a client to telnet to your PC. You can ping the PC, but you cannot telnet or ftp to it. You apparently have the PC services up and running and can access those services from other clients on your LAN. Am I correct? If so I would think that maybe there is a firewall in between somewhere. Maybe you have a personal firewall that only allows people from your own subnet to access your machine. It's hard to say.

Re: telnet connection

JUAN_91 — Thu, 08 Mar 2007 14:16:40 GMT

Thanks Court!
If I understand this correctly you are using the HP-UX box as a client to telnet to your PC.
You can ping the PC, but you cannot telnet or ftp to it. You apparently have the PC services up and running and can access those services from other clients on your LAN. Am I correct? YES YOU ARE.
If so I would think that maybe there is a firewall in between somewhere. JUST 2/3 ROUTERS.
Maybe you have a personal firewall that only allows people from your own subnet to access your machine. It's hard to say.
AFAIK THERA ARE NO FIREWALLS...

TIA&BR!

Re: telnet connection

Court Campbell — Thu, 08 Mar 2007 14:31:38 GMT

For grins why not put a cross-over cable directly between the PC and the HPUX box. Make sure the PC and the HPUX box are on the same network. Then try and connect. If it works there is something definitely blocking in between.

Re: telnet connection

JUAN_91 — Thu, 08 Mar 2007 14:52:49 GMT

Thanks Court!
Boxes are several kms separated....

Re: telnet connection

Court Campbell — Thu, 08 Mar 2007 15:01:34 GMT

Another option is to install nmap on the HP-UX box and try and do a port scan of the PC.

http://hpux.cs.utah.edu/hppd/hpux/Networking/Admin/nmap-3.93/

I have a feeling in the end it is going to be something really simple.

Re: telnet connection

JUAN_91 — Wed, 21 Mar 2007 09:23:49 GMT

Hi, I'm afraid it is not possible to install such a SW in the server, it could be little risky due to other apps running and I prefer leaving the box untouched...sorry...
Any other tool maybe?
TIA&BR,
Juan.

Re: telnet connection

JUAN_91 — Wed, 21 Mar 2007 09:25:50 GMT

Hi Steven,
I restarted inetd but the pb still remains...
Any suggestion in order to blame network/routing?

TIA&BR,
Juan.