Question: how to configure ntp server on windows 2008 r2?
Answer: Click Start, click Run, type regedit, and then click OK. Locate and then click the following registry entry: ...  In the right pane, right-click AnnounceFlags, and then click Modify. In the Edit DWORD Value dialog box, under Value data, type 5, and then click OK. Enable NTPServer. ...  Exit Registry Editor.