NTP Failed Validity Tests 20

I am trying to sync my cisco devices to NTP server (Windows 2003) but
even I send/receive the NTP packets to NTP server my devices can't
sync to server...

I receive this debug message on my devices:

3w5d: NTP: xmit packet to 10.4.1.1:
3w5d: leap 3, mode 3, version 3, stratum 0, ppoll 64
3w5d: rtdel 0000 (0.000), rtdsp 10001 (1000.015), refid 00000000
(0.0.0.0)
3w5d: ref 00000000.00000000 (03:30:00.000 TST Mon Jan 1 1900)
3w5d: org C9B63EA5.F4000000 (17:03:25.953 TST Thu Mar 29 2007)
3w5d: rec AF5F6364.FDD417F2 (03:06:04.991 TST Sun Mar 28 1993)
3w5d: xmt AF5F6365.FDDC943A (03:06:05.991 TST Sun Mar 28 1993)
3w5d: NTP: rcv packet from 10.4.1.1 to 10.10.10.11 on Vlan7:

3w5d: leap 3, mode 4, version 3, stratum 0, ppoll 64
3w5d: rtdel 0000 (0.000), rtdsp 10400 (1015.625), refid 00000000
(0.0.0.0)
3w5d: ref C9B62DEE.6C10624D (15:52:06.422 TST Thu Mar 29 2007)
3w5d: org AF5F6365.FDDC943A (03:06:05.991 TST Sun Mar 28 1993)
3w5d: rec C9B63EA6.F4000000 (17:03:26.953 TST Thu Mar 29 2007)
3w5d: xmt C9B63EA6.F4000000 (17:03:26.953 TST Thu Mar 29 2007)
3w5d: inp AF5F6365.FE345DEB (03:06:05.992 TST Sun Mar 28 1993)

3w5d: NTP: packet from 10.4.1.1 failed validity tests 20

3w5d: Peer/Server Clock unsynchronized

Thanks

.

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