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This is the strangest issue I've ever seen however the TpLink T2U V2 when connected to the TPlink Vr600 V2 will not sync with ANY windows time server, full stop.
The issue only occurs when the T2U is connected to the VR600 modem.

If I connect a different USB wireless adapater to VR600 from the same machine, time sync works
If I connect the T2U to a different modem from the same machine, time sync works.

If I connect T2U to VR600 time sync suddely times out and refuses to sync.

I have used multiple machines, running different windows versions to rule out machine config / FW issues

VR600 is running latest AU Beta firmware.

it should be noted that if I use a different usb adapter other then T2U time sync works perfectly with the VR600,

I really need somebody with a T2U V2 (AU) and VR600 V2 (AU) to see if they have issues with syncing to windows time server - time.windows.com or the time.nist.gov server - or ANY server for that matter.