cannonical name errors

Thrasher · 06-05-2004, 08:47 PM

I recently started seeing these new errors in my /var/log/maillog

Jun 5 15:18:14 mail popper[7185]: (v4.0.5) Unable to get canonical name of client xx.xx.xx.xx: Unknown host (1)
(xx.xx.xx.xx = any ip)

I dont recal making any changes other than the host name of server when I set it up to go live with a new domain name.

Anyone have any idea what I should be looking for?

Thx in advance

chort · 06-05-2004, 11:37 PM

It looks like you have a problem with DNS resolution. What are the contents of /etc/resolv.conf, and ha(ve)s you DNS server(s) changed? You mentioned that you changed domains, are those IP addresses on your local LAN? If so, did you forget to change the search domain in your resolv.conf?

Thrasher · 06-07-2004, 10:53 AM

The contents of my /etc/resolve.conf is :
nameserver (dns server ip)

I am using a public ip address but the dns server is on the same network as my mail server.

Pete M · 06-07-2004, 12:14 PM

Thrasher

With your new domain name did you make any changes to /etc/hosts this is where mail servers check for which domain they are responsible for

For instance mine reads

127.0.0.1 server.yourdomain.com server localhost.localdomain localhost

Where 'server' is the hostname of my machine, you need localhost in there otherwise things get messy

This is on Redhat by the way

Hope this helps

Pete

Thrasher · 06-08-2004, 01:49 PM

Yes, I have all that in the /etc/hosts file.

Thx for the info though. It all helps.