How to configure Windows 11 as a local NTP server (works in Windows 10, not in 11)

Hello,

I'm trying to configure my Windows 11 Pro machine to act as a local NTP server on my LAN. I followed the same procedure that works perfectly on Windows 10, including:

1. Modifying the registry:

sql
Copy
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\TimeProviders\NtpServer
"Enabled"=dword:00000001

Setting AnnounceFlags:

sql
Copy
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\Config
"AnnounceFlags"=5

Updating Start and Type values, and ensuring the w32time service is set to Auto and restarted.

Opening UDP port 123 in the firewall (both inbound and outbound).

Restarting the service:

arduino
Copy
net stop w32time
net start w32time

Problem:

The same setup on Windows 10 works fine, and my devices sync time from it.

On Windows 11, NTP clients (like Linux, Jetson, etc.) fail to sync.

Using w32tm /query /status and /peers looks fine locally.

Questions:

Has anything changed in NTP server support in Windows 11?

Is there a new service dependency or network configuration needed?

Are there known issues with the Windows 11 implementation of W32Time as an NTP server?

Any insights or updated guidance would be appreciated.

Thanks!Hello,

I'm trying to configure my Windows 11 Pro machine to act as a local NTP server on my LAN. I followed the same procedure that works perfectly on Windows 10, including:

Modifying the registry:

sql
Copy
HKEY_LOCAL_MACHINE\

Setting AnnounceFlags:

sql
Copy
HKEY_LOCAL_MACHINE\

Updating Start and Type values, and ensuring the w32time service is set to Auto and restarted.

Opening UDP port 123 in the firewall (both inbound and outbound).

Restarting the service:

arduino
Copy
net stop w32time
net start w32time

Problem:

The same setup on Windows 10 works fine, and my devices sync time from it.

On Windows 11, NTP clients (like Linux, Jetson, etc.) fail to sync.

Using w32tm /query /status and /peers looks fine locally.

Questions:

Has anything changed in NTP server support in Windows 11?

Is there a new service dependency or network configuration needed?

Are there known issues with the Windows 11 implementation of W32Time as an NTP server?

Any insights or updated guidance would be appreciated.

Thanks!