Can not change the internet time server

[KlausDaube]

Dear all,

I have checked many sources including MS official pages. They claim that the list of time servers can be modified by entering a new time server (e.g. ntp11.admin.ch) in the field of the dialogue Date and Time > Internet Time > Change settings…

When entering any string into that field and using button Update now I get an error
Date and Time
An error occurred
Your changes could not be saved.

Even If I now select what was in already (time.windows.com) I get this message.

In the registry (HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\datetime\servers) there are the following entries defined:

(default) 0
0 ntp11.admin.ch
1 ntp12.admin.ch

2 ntp13.admin.ch

3 time.windows.com

4 time-a.nist.gov

5 time-b.nist.gov

But the list in Date and Time > Internet Time > Change settings…" shows only two entries:
time.windows.com

time.nist.gov

Note: the second is not in the REG list at all

→ where do these entries come from?

→ why are the entries from REG not taken?

→ Why can I not change the time server to what I have defined in the REG?

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