[plug] Telnet probs

[Matt Kemner]

On Mon, 23 Nov 1998, Tony Clark wrote:

> I get this problem every once in a while when I try to log into gw.  I can
> log into the other machines on the same network without a problem.  Anyone
> got any ideas what would be causing it?

> Nov 23 06:32:36 gw in.telnetd[8022]: warning: can't verify hostname:
> gethostbyna 
> me(slip202-135-89-240.hk.hk.ibm.net) failed
>      
> Nov 23 06:32:36 gw in.telnetd[8022]: refused connect from 202.135.89.240

The IP address of your machine (202.135.89.240) resolves to the name
slip202-135-89-240.hk.hk.ibm.net, but slip202-135-89-240.hk.hk.ibm.net
does not resolve to anything.  Your gw probably has the line
"ALL: PARANOID: DENY" in /etc/hosts.allow or ALL:PARANOID in
/etc/hosts:deny, which tells tcpd that it is not to accept connections
from hosts where the reverse and forward DNS entries do not match.
Contact "ibm.net" and tell them to add forward DNS entries for those
hostnames.

 - Matt