Firewall blocks windows clock updating
To check it open a Date and Time window (click "time" icon in the lower right corner of the desktop) - Note that w32time service may only be enabled when no other ntp daemon is installed on your system. To check if w32time is running, do the following: go to Control Panel-Services.
Scroll to "Windows Time" feature and check its "Status", which should be on "running".
To make any w32time changes in command line window one has to run cmd program as administrator (see Figure 4).
The actual IP address of the NTP server or its host name must be entered instead of [server].
All data sent to and from your computer passes through the firewall, and the data is filtered by the firewall to make sure that each packet conforms to the firewall's user-defined rules.
Packets that don't conform to the firewall's rules are blocked while packets that do conform to the rules pass through the firewall without incident.
Meinberg high quality time servers offer a broad spectrum of time synchronization solutions for networks of any size and industries.(see link in Resources) You won't pay for updates to the software or for technical support during the license period.Windows Firewall is seamlessly integrated with Windows.w32time sends namely symmetric active instead of client mode packets to a NTP server.This problem has not been observed with the w32time version which has been shipped with Windows 2000, only with later versions.