• Subject: Re: Telnet problems
  • From: James Turnbull <jamest@xxxxxxxxxxxxxxx>
  • Date: Tue, 23 Dec 1997 10:45:32 +1100
  • Organization: International Technology Group

There are two potential problems that I can think of:

1.  The address you are coming from is probably being filtered by a security 
program called TCPD.

Look in file etc/inetd.conf.  There is one line for each service managed by 

The format of this file is:
Service Name    Comment    ...    ... end of the line lists a program to run, 
what to call the
program and any arguments to pass to the program.

Find the TCPD program and if it is being used examine two files in etc 
directory, hosts.allow and

These list all the addresses that are being allowed and denied.

2.  The other option is that the address you are coming from has no valid 
reverse lookup and is thus
denied.  Check your DNS configuration on the linux box.  That could explain wh 
ythe PC worked and
the 400 didn't.  Without a valid reverse DNS lookup the linux box will deny the 
connection for
security reasons.

Hope this helps.

                                                        James Turnbull
                                                        AS/Tech Consulting

Matthias Oertli wrote:

> I was looking for security problems without any success. I can telnet to the
> linux box from any other machine on the same subnet without a problem.
> To be sure I brought tcp/ip on the 400 down and assigned it's IP address to a
> PC from which I could again successfully telnet to the 400.

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