topic Re: a problem about telnet in Operating System - HP-UX

a problem about telnet

Nail Wang — Tue, 09 Aug 2005 00:10:41 GMT

when I telnet,display:
telnet 202.96.113.7
Trying...
Connected to localhost.
Escape character is '^]'

the diamon inetd is runnning,I can't use telnet and ftp,I check the inet.conf and other folder about telnet.what; wrong?

Re: a problem about telnet

Rajesh SB — Tue, 09 Aug 2005 00:28:31 GMT

Hi,

You can verify the ftp & telnetd services status by

# netstat -na|grep -e 21 -e 23

If the output shows LISTEN like below, implies ftp(port:21) & telnet(port:23) services are up and running.

tcp 0 0 *.21 *.* LISTEN
tcp 0 0 *.23 *.* LISTEN

Give some details of problem, if other.

Regards,
Rajesh

Re: a problem about telnet

morganelan — Tue, 09 Aug 2005 00:40:52 GMT

Hi,
I think you must do the following testing:
The Transport Level Loopback Test can be implemented using Internet Services. In this case, you use telnet and ftp to systematically focus on a problem.

A.Execute: telnet to remote host. Try to establish a telnet connection to the remote host.
B.Successful? If your telnet attempt was successful, stop. The connection is okay through the Transport Layer (OSI Layer 4).
C.Execute: ftp to remote host. Unlike telnet, ftp does not go through a pseudo-terminal driver (pty) on your system. This step tests to see if the pty is why telnet failed.
D.Successful? If ftp is successful, you likely have a problem with a pty on your system. Contact your HP representative.
E.TCP configured on local or remote host? Neither telnet or ftp will work if TCP is not configured on either side of the connection. Check the /etc/protocols file on both hosts to be sure TCP is installed and configured.
F.Configure TCP. If necessary, install TCP on either or both hosts.
G.Network congested? If TCP is installed on both hosts, do a file transfer to another remote host on the network. Use netstat to check for lost packets.

If 10 percent or more packets are lost, the network is extremely busy. If you cannot determine the cause, contact your HP representative for help.

If both ftp and telnet fail, the /etc/inetd.conf file may be configured incorrectly or the inetd daemon may not be running on the remote system.

If the problem is not resolved, more detailed diagnostics are required. Again, contact your HP representative.

Re: a problem about telnet

morganelan — Tue, 09 Aug 2005 01:16:45 GMT

Hi,
if you want to start connection logging, run the following command:

#/usr/sbin/inetd -l

Correct the files. If there was an incorrect entry or no entry in the /etc/inetd.conf or /etc/services files, enter the correct information and continue with 1D1.
1F.

Reconfigure the Internet daemon. To reconfigure inetd, execute the following as superuser:

#/usr/sbin/inetd -c

Re: a problem about telnet

morganelan — Tue, 09 Aug 2005 01:19:02 GMT

Hi,
if you want to start connection logging, run the following command:

#/usr/sbin/inetd -l

After issue the above command you can try to connect the server via ftp and telnet and then see the log file in /var/adm/syslog/syslog.log.

Correct the files. If there was an incorrect entry or no entry in the /etc/inetd.conf or /etc/services files, enter the correct information and continue with 1D1.
1F.

Reconfigure the Internet daemon. To reconfigure inetd, execute the following as superuser:

#/usr/sbin/inetd -c