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NTP sync fails but NTP servers are reachable on Windows 10

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I can't get my clock to sync in Windows 10.

When asking for a sync in either the control panel, or by doing w32tm /resync my computer sends some NTPv3 packets to pool.ntp.org (I manually set that server but it doesn't matter which server I use) and does not get a response.

However, if I do w32tm /monitor /computers:pool.ntp.org it works, and I can see in Wireshark that my computer sends NTPv1 packets, and gets a response.

However, if I connect my computer to my phone's mobile hotspot, time sync works, with NTPv3. Also, another Linux computer on the same network as my Windows 10 can sync without problems (and I see it using NTPv4).

I have tried:

  • Restarting Windows Time Service
  • Resetting Windows Time Service
  • Opening port 123 in the router firewall
  • Changing DNS settings (I use DNS-over-TLS)

and have not gotten it to work.

My router is on a double NAT configuration (i.e. Internet - Another router I don't control - My router - My PC), which can cause NTP problems, but then I don't understand how my Linux laptop can sync.

Edit 1:

NTP packet with responseNTP packet with response

NTP packet without responseNTP packet without response


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