This seems to be my week for problems. I have a relatively new server with
a fresh install of the Nuonce CentOS 3.5 which I've used on several servers.
I was having problems with sendmail on the server and I realized that the
problem is that the server can't do nslookups.
When trying to do an nslookup from the command line I get:
connection timed out; no servers could be reached
I checked and rechecked the dns server listings on the GUI are correct, and
those servers definetely allow recursion from the server in question. I
then enabled the DNS server on the server itself and tried again with an
nslookup. Still the same result. I even tried restarting named from the
command line and it didn't help either.
It's almost as if there is a firewall blocking connections, but there isn't
any. IPtables doesn't seem to have any rules blocking dns. All other
services (ftp, ssh, http) work fine.
What could be the problem?