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Domain time sync with external source will not function

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Hi,

I've spent far too long trawling answers on this and exhausted all I can come up with so far. While I can get a stripcheck working fine (which I understand confirms NTP connection with the time source is functioning), I still receive an error.

Steps so far:
Deregistered, re-registered the time service.
Set up to point to local NZ NTP time servers as per http://technet.microsoft.com/en-us/library/cc786897.aspx

>w32tm /config /manualpeerlist:"1.nz.pool.ntp.org,0x1 3.oceania.pool.ntp.org,0x1 2.oceania.pool.ntp.org,0x1" /syncfromflags:manual /reliable:yes /update

Double checked all registry settings, restart service
Test using /stripchart:

w32tm /stripchart /computer:1.nz.pool.ntp.org /samples:5 /dataonly
Tracking 1.nz.pool.ntp.org [131.203.103.219:123].
Collecting 5 samples.
The current time is 6/01/2014 12:59:54 p.m..
12:59:54, +00.2908765s
12:59:56, +00.2888507s
12:59:58, +00.2873896s
13:00:00, +00.2877402s
13:00:02, +00.2878041s

However, /monitor fails:
C:\>w32tm /monitor
pdce.domain.local *** PDC ***[[xxxx]:123]:
ICMP: 0ms delay
NTP: error WSAECONNRESET - no server listening on NTP port
dc.domain.local[xxxx:123]:
ICMP: 0ms delay
NTP: error ERROR_TIMEOUT - no response from server in 1000ms

Resync fails:

>w32tm /resync
Sending resync command to local computer
The computer did not resync because no time data was available.

>w32tm /query /peers
#Peers: 1

Peer: 1.nz.pool.ntp.org,0x1
State: Pending
Time Remaining: 0.0000000s
Mode: 0 (reserved)
Stratum: 0 (unspecified)
PeerPoll Interval: 0 (unspecified)
HostPoll Interval: 0 (unspecified)

I've tried different time servers, different servers, all with the same result, which I would guess to then be a general network issue, but then the /stripchart test works.

There are no GPO's interfering with this.

Any help/advice would be very welcome. Thanks in advance.


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