NTP client in Windows 7 Professional Does Not Sync

I have an NTP server running on an Ubuntu Linux box. All of my other linux boxes are able to synchronize to this NTP server. My Windows 7 Professional box is not even after trying multiple steps suggested in these forums.
The NTP server is on the local network; the firewall and anti-virus do not seem to be causing issues. If I test the NTP server connection using the following line:
/stripchart /computer:192.168.2.63 /packetinfo
I see the following information:
Tracking 192.168.2.63 [192.168.2.63:123].
The current time is 1/28/2014 9:05:24 PM.
21:05:24 d:+00.0349180s o:-01.0741307s [ * | ]
[NTP Packet]
Leap Indicator: 0(no warning)
Version Number: 1
Mode: 4 (Server)
Stratum: 1 (primary reference - syncd by radio clock)
Poll Interval: 3 (8s)
Precision: -22 (238.419ns per tick)
Root Delay: 0x0000.0000 (unspecified)
Root Dispersion: 0x0001.DE2F (1.8679047s)
ReferenceId: 0x47505300 (source name: "GPS")
Reference Timestamp: 0xD690FAAE12CA0936 (150871 15:33:02.0733953s - 1/27/2014 10:33:02 AM)
Originate Timestamp: 0xD692E0645BE2FB0C (150873 02:05:24.3589322s - 1/28/2014 9:05:24 PM)
Receive Timestamp: 0xD692E0634D60F136 (150873 02:05:23.3022605s - 1/28/2014 9:05:23 PM)
Transmit Timestamp: 0xD692E0634D6672F1 (150873 02:05:23.3023445s - 1/28/2014 9:05:23 PM)
[non-NTP Packet]
Destination Timestamp: Roundtrip Delay: 34918000 (+00.0349180s)
Local Clock Offset: -1074130700 (-01.0741307s)
Which indicates to me that I am able to see the server and receive NTP packets.
However, if I try to configure the server manually thusly:
w32tm /config /manualpeerlist:192.168.2.63,0x1 /syncfromflags:manual /update
and perform a resync:
w32tm /resync /rediscover
I get the following error:
The computer did not resync because no time data was available.
But -- using wireshark I can see the NTP request go out and what looks like a valid NTP packet return from my server.
What other settings am I missing here? Why would an NTP packet arrive and not be recognized by w32tm?

I turned on the debug logging; I additionally see this information:
150873 02:42:22.3054052s - Reachability: Attempting to contact peer 192.168.2.63,0x1 (ntp.m|0x1|0.0.0.0:123->192.168.2.63:123).
150873 02:42:22.3054052s - PeerPollingThread: WaitTimeout
150873 02:42:22.3054052s - Polling peer 192.168.2.63,0x1 (ntp.m|0x1|0.0.0.0:123->192.168.2.63:123)
150873 02:42:22.3054052s - Sending packet to 192.168.2.63,0x1 (ntp.m|0x1|0.0.0.0:123->192.168.2.63:123) in Win2K detect mode, stage 1.
150873 02:42:22.3054052s - PeerPollingThread: waiting forever
150873 02:42:22.3054052s - PollIntervalChange(192.168.2.63,0x1 (ntp.m|0x1|0.0.0.0:123->192.168.2.63:123)): reclamp: 17 -> 10 (min=4, max=17, sys=10)
150873 02:42:22.3054052s - Peer poll: Max:604800.0000000s (special) Cur:00.0000000s
150873 02:42:22.3054052s - PeerPollingThread: waiting 604800.000s
150873 02:42:22.3364070s - ListeningThread -- DataAvailEvent set for socket 1 (0.0.0.0:123)
150873 02:42:22.3364070s - ListeningThread -- response heard from 192.168.2.63:123 <- 192.168.3.54:123
150873 02:42:22.3364070s - /-- NTP Packet:
150873 02:42:22.3364070s - | LeapIndicator: 0 - no warning; VersionNumber: 3; Mode: 4 - Server; LiVnMode: 0x1C
150873 02:42:22.3364070s - | Stratum: 1 - primary reference (syncd by radio clock)
150873 02:42:22.3364070s - | Poll Interval: 17 - out of valid range; Precision: -22 - 238.419ns per tick
150873 02:42:22.3364070s - | RootDelay: 0x0000.0000s - unspecified; RootDispersion: 0x0001.E6B3s - 1.90117s
150873 02:42:22.3364070s - | ReferenceClockIdentifier: 0x47505300 - source name: "GPS"
150873 02:42:22.3364070s - | ReferenceTimestamp: 0xD690FAAE12CA0936 - 13035310382073395300ns - 150871 15:33:02.0733953s
150873 02:42:22.3364070s - | OriginateTimestamp: 0xD692E90E4E2F0902 - 13035436942305405200ns - 150873 02:42:22.3054052s
150873 02:42:22.3364070s - | ReceiveTimestamp: 0xD692E90D43D54D4D - 13035436941264973500ns - 150873 02:42:21.2649735s
150873 02:42:22.3364070s - | TransmitTimestamp: 0xD692E90D43DA4B0A - 13035436941265049600ns - 150873 02:42:21.2650496s
150873 02:42:22.3364070s - >-- Non-packet info:
150873 02:42:22.3364070s - | DestinationTimestamp: 150873 02:42:22.3364070s - 0xD692E90E561EC4E7150873 02:42:22.3364070s - - 13035436942336407000ns150873 02:42:22.3364070s - - 150873 02:42:22.3364070s
150873 02:42:22.3364070s - | RoundtripDelay: 30925700ns (0s)
150873 02:42:22.3364070s - | LocalClockOffset: -1055894500ns - 0:01.055894500s
150873 02:42:22.3364070s - \--
150873 02:42:22.3364070s - ListeningThread STC:76245282
150873 02:42:22.3364070s - Peer 192.168.2.63,0x1 (ntp.m|0x1|0.0.0.0:123->192.168.2.63:123) is not Win2K. Setting compat flags.
150873 02:42:22.3364070s - Packet test 6 failed (not syncd or bad interval since last sync).
150873 02:42:22.3364070s - Ignoring packet that failed tests from 192.168.2.63,0x1 (ntp.m|0x1|0.0.0.0:123->192.168.2.63:123).
150873 02:42:38.3063204s - W32TmServiceMain: timeout
150873 02:42:38.3063204s - Sample Prepared at 130354369583063204 for peer 192.168.2.63,0x1 (ntp.m|0x1|0.0.0.0:123->192.168.2.63:123)
I've done a little searching on what causes the "Packet test 6 failed" error without too many useful results ... any thoughts?

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