Unable to connect to server using hostname with telnet and browser

Schlumpf42 · 10-13-2004, 02:24 PM

Hi,

I have a strange problem, I'm not able to connect to a host lets say
this site (I cannot put in the hostname) with the hostname using telnet or a browser.
When I use telnet it tells my that it tries to connect to 1.0.0.0!
But ... I'm able to do a nslookup or ping to this host!
Once I have done that telnet and browser work.

I tried several 2.6 Linux distributions but none of them work.
If I install a 2.4 distro I don't have a problem.

Now to my hardwar setup I'm using a DSL router + an additional router (cause the DSL router has only 1 port) to connect 2 PCs.
I'm using DHCP, but setting a static IP still doesn't work.

Any ideas?

Thanks

Tap-Out · 10-13-2004, 05:49 PM

Hello there,

I have a couple of thoughts:

1) Is the telnet service turned on?

Code:

su
root password
/sbin/chkconfig telnet on
/etc/init.d/xinetd restart

2) Is your firewall blocking port 23 traffic?

Check those out and see if that works. If not post back and we'll see what we (the wonderful members of the LQ board) can work out.

Cheers

Tap

Schlumpf42 · 10-13-2004, 06:14 PM

Hi,

hmmm ... I don't think the telnet service has anything to do with the problem.
I don't want to telnet to my machine. Also I can telnet using IP (once I did a nslookup and figured it out).
Also I'm only using telnet as an example of application that has problems to resolve the hostname.
What I did was something like: telnet <hostname> 80

I don't have any firewall software running.

Rico

Tap-Out · 10-13-2004, 09:13 PM

I appoligse, I have indeed misunderstood your orignal question.

I would change your /etc/hosts file on the computer you're working on.

add the line:

192.168.0.1 servername

to your hosts file.

Obvously replace 192.168.0.1 with the IP address of your telnet/web server and servername with the actual name of your server.

Hope that helps more than my last post.

Cheers

Tap

Schlumpf42 · 10-13-2004, 11:38 PM

Well ... thanks for the reply, but that's is not my problem.
I cannot access any website with telnet or a browser if I don't use IP instead of hostnames. Adding all those hosts to my hosts file is obviously not an option.
Programs other than nslookup or ping cannot resolves hostnames from the dns server it seems.
If I try the following command: telnet www.linuxquestions.org 80
it says that it tries to connect to 1.0.0.0 which means that it resolves www.linuxquestion.org as ip address 1.0.0.0 which is very unlikely.

Thanks

Tap-Out · 10-14-2004, 02:06 AM

find out your ISP's DNS servers (there's always at least 2 sometimes three).

edit the /etc/resolv.conf file. Put in

Code:

nameserver 12.34.56.78
nameserver 78.65.43.21

where the IP addresses are your ISP's DNS servers.

That should be it. If not post back and we'll move on

(It's a process of elimination).

Cheers

Tap

Schlumpf42 · 10-14-2004, 11:03 AM

I tried that, that is not the problem. The problem is not that my machine cannot resolve hostnames at all.
If I do a nslookup or ping it will. It seems that only certain applications like telnet or Mozilla don't resolve correctly.

trol188 · 07-12-2021, 02:13 PM

Quote:

Originally Posted by Schlumpf42

I tried that, that is not the problem. The problem is not that my machine cannot resolve hostnames at all.
If I do a nslookup or ping it will. It seems that only certain applications like telnet or Mozilla don't resolve correctly.

The solution is to clean the dnscache of the computer (ifconfig /flushdns (in windows)), and the browser ( turn off pre-fetch DNS ).