in openfire, the server name is really the xmpp domain for your service, and not the name of the server itself. So, you'll want do change the xmpp.domain property to "xmpp.domain.name"
Now by doing this your jid will change from abc012.domain.name to xmpp.domain.name, so you'll need to be sure you update your admin.authorized.jids to reflect the change before you restart the service, otherwise you might get locked out, and will have to go through the install script again or manual update the database.
You'll also most likely have to regenerate the self signed ssl if you're using one.