[CentOS] sudo doing DNS lookup

From: Steve Clark <sclark at netwolves.com>
> Without the:
> Defaults fqdn
> it hangs for a long time, this is when I don't have connection to the net,
> if I have connection there is just a slight pause while tries to do the DNS 
> lookup.

Did you compare the following files between both servers?
  /etc/hosts
  /etc/resolv.conf
  /etc/nsswitch.conf

JD