Time jumping forward on NTP failure

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http://askubuntu.com – I have been having some weird problems with NTP for a while. If I use ntpdate to set the time then it sets fine. ntpd then invariably fails to find a server (I have loads configured) and decides to set the clock forward about 5 hours. It's a Xen server with dom0 set to a different timezone so I'm not sure if that is interfering with it. How can I make sure I ignore the dom0 time and have ntpd not change the time if it fails to reach a time server? (HowTos)