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"Cannot find KDC" error joining Windows 2000 domain

When I try to join a Windows 2000 domain, I get the following error:
utils/net_ads.c:ads_startup(186) ads_connect: Cannot find KDC for requested realm.
  1. The first thing to do is to make sure your DNS is working fine on your LAN. It probably is, but the right answer is often the simplest. Assuming that you can ping the server and that DNS is set up correctly throughout your network, then move on to the other suggestions below.
  2. Look at the /etc/krb5.conf and make sure that where it says "example.com/EXAMPLE.COM" that your Domain/Realm settings match up.
  3. Make sure that you are using the latest version of Samba, 3.0.13, and that you have gone through the Official How-to.

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