Redhat 8 Refusing Network Connections

[Khalid A. Al-Tayaran]

Hi team,

I installed Linux RedHat 8 to use as an application server. But I am not able to access it using telnet. I found that the default security level is high and when I switch to Med. and enable telnet from security level in System Settings it returns back to high and refuses any connections to the machine. I can ping with no problems. Also, I have posted in a previous thread the same situation with Mandrake 9 and managed to get some answers that let me use telnet and Exceed with X windows from my Win2k system.

Hope to solve this one with you guys... Thanks,,,,

[U.SivaKumar_2]

Hi,

Run this command,

#ntsysv

enable xinetd and telnet in that menu. disable iptables and ipchains.

now

#service xinetd start

#iptables -F


try to telnet now . should work

regards,
U.SivaKumar

[Khalid A. Al-Tayaran]

Hi,

Thanks U.Siva

I accessed the same list (from ntsysv) through the GUI og GNOME. I disabled iptables and xinetd is laready enabled. ipchains dies not exist.

Still can't access machine.


Any further help ??

[U.SivaKumar_2]

dear khalid ,

you have to enable telnet also in the ntsysv menu.

after this better to restart.

[Khalid A. Al-Tayaran]

Hi,

Sorry, U.Siva. I did enable telnet and restart the machine. But still no changes.

[U.SivaKumar_2]

can u paste this command's output ?

#iptables -L

and also the contents of /etc/xinetd.d/telnet file .
there should not be a "disabled" string in that file.
Also check whether xinetd is listening in telnet port.
#lsof -i
regards,
U.SivaKumar

[Khalid A. Al-Tayaran]

Hi again,

Sorry could not post output from linux PC the internet connection failed. Using windows connection.

1- iptables -L

Chain INPUT (policy accept)
target prot opt source

repeated three times.


2- file telnet does not exist under /etc/xinetd.d/

3- lsof -i shows no telent listeners.....

[U.SivaKumar_2]

Hi,

create a file name telnet under /etc/xinetd.d directory with below contents.

service telnet
{
disable = no
flags = REUSE
socket_type = stream
wait = no
user = root
server = /usr/sbin/in.telnetd
log_on_failure += USERID
}

the owner should be root and permission should be -rw-r--r-- .

Now
#service xinetd restart

Hope your problem is solved.

regards,
U.SivaKumar

[Khalid A. Al-Tayaran]

Hi,


Sorry for the late reply....

I created the telnet file under /etc/xinetd.d/ an restarted the system but no change.

I notices in the service configuration GUI (GNOME Menu-> Server Settings-> Services) that telnet service is checked but when I select it a message displayed on the bottom of the window saying that I should enable xinetd. xinetd is already checked in the same list ???

Also, the list of services can be started/stopped and restarted with buttons except for the telnet service these buttons are disabled !!!???

One more thing: You have mentioned that file /etc/xinetd.d/telnet should have the entry:
usr/sbin/in.telnetd which does not exist in my system!!

[Stuart Browne · Accepted solution]

You did a workstation install of RH8 didn't you?

The package 'telnet-server' is not installed. ("rpm -q telnet-server" will confirm this).

Install it from the CD's ("rpm -Uvh telnet-server*.rpm"), I think it's on the 2nd CD (don't have a copy of it here to confirm).

Once that's done, simply issue 'chkconfig telnet on' to make sure it's turned on (no need to restart the machien or anything else after that), and you should be able to telnet to the machine (assuming TCP wrappers and firewall stuff isn't denying it).

NOTE: You won't be able to telnet in as 'root', you'll have to go in as another user first.

[Khalid A. Al-Tayaran]

Hi,


Yes, I found that I didn't install telnet. I was actually re-installing Linux due to a hardware problem, so I was re-installing fast and it seems I missed the server programs (telnet, dhcp,....etc.).
I installed telnet server then everything went O.K.

Special thanks to Stuart Browne.

also my thanks go to U.SivaKumar...

Thanks to all members of these forums,,,,,,, This is the the number one forum.