telnet error

[Ganesh Babu]

if i do a telnet

ex., telnet 80

from a Hp-UX box.. i get an error as "Parameter Not Set" why is it?? same thing runs from other hp-ux box.

Ganesh

[Jeff Schussele]

HI Ganesh,

Run the following on the system to which you were telneting

netstat -an | grep 80

Is there anything listening on port 80 like a webserver or something? I suspect you tried to telnet to a port in use & got that response from whatever was listening.

HTH,
Jeff

[MarkSyder]

What happens if you telnet to the ip address?

Mark Syder (like the drink but spelt different)

[Ganesh Babu]

Hi Jeff,
Yes there is a webserver running in the destination server on port 80. Also the same command works from other 2 machines..

Mark,
Same result for ip address also..

Ganesh

[Steven E. Protter]

Okay,

The web server should be downing an error in the error_log file

if its apache that's the name.

It would appear to be web server configuration or permissions on the html doc. You should get a message like this.

Attaching a sample run.

SEP

[Helen French]

On the target system, run this command:

# cat /etc/services | grep telnet

Find out the port where telnet is running (default port is 23) and try again on that port number. As you said, port 80 is used by a web server.

# telnet system_name 23

OR

# telnet system_name

[Ganesh Babu]

Hi SEP,
This is a server which we don't own.. so we cannot see the log files.. the message attached were seen when i tried the same command from other machines which were working..

Wilson,
When i try it in the default port
telnet

i get the following error

Trying...
Unable to connect to a server: Error 0
telnet: Unable to connect to remote host: Error 0

Ganesh

[Helen French]

Did you find out which port telnet daemon is listening to? Find out the port number from /etc/services and do:

# netstat -an | grep port_number

If the daemon is not running, you won't be able to connect through telnet.

Are you able to connect to the same target system from other servers? If yes, check if any telnet restriction is set.

[Ganesh Babu]

hi Wilson,
Yes the telnet is running in port 23.. i was able to connect from other servers.. i am checking the permissions now..

Ganesh

[Paul Cross_1]

telnetd does not have to be running in order to telnet to a port not controlled by telnetd. telnet port 80 should work if:

-there is something listening on port 80
-there is no network magic to prevent you from doing so (firewall, etc.)

[RAC_1]

Do just telnet. On telnet prompt do toggle options and try to open connection.
open hostname/ip address.

Post results.

Anil

[Ganesh Babu]

Hi Anil,

$ telnet
_telnet[6]: 3: parameter not set

another server

$telnet
telnet> open
Trying...
Unable to connect to a server: Error 0
telnet: Unable to connect to remote host: Error 0

Ganesh

[Kenneth Platz · Accepted solution]

Try using /usr/bin/telnet instead. It looks like the telnet you are using is actually a shell script which is in turn spitting the "Parameter not set" error.

[RAC_1]

type telnet.

What it returns? It should return /usr/bin/telnet. Seems that it is some script through which you are running telnet.

Anil

[Ganesh Babu]

yes..

when i did

/usr/bin/telnet 80

i got the connection made and got the message from the webserver..

thanks Guys..

Now how will I change it like, if i run telnet it should user /usr/bin/telnet


Ganesh

[Sridhar Bhaskarla]

Hi Ganesh,

I have never seen this error while using telnet.

Do a 'which telnet' and compare the binary against another server. If this is really a binary, run it with 'tusc' and see if you get any hints.

-Sri

[Sridhar Bhaskarla]

Wow!!.. as you can see I almost posted at the same time as your response.

-Sri

PS: no points for either posts.

[Ganesh Babu]

Hi All,
Thanks for all your inputs..

actually when i ran
$type telnet or
$which telnet

i got the path as
/opt/socks/bin/telnet

i think it is the socksified telnet and that is the reason it was not working..

Now how do i change this to /usr/bin/telnet??

Ganesh

[RAC_1]

echo $PATH.

Your /opt/socks/xxx path is first. Correct your path. put /usr/bin before /opt stuff

Anil

[Ganesh Babu]

Thanks Anil & all of the guys who had helped me out...

It worked.

Ganesh