If the firewall is on, one has to enable Inbound and Outbound Rules for "Specific local ports" in our case UDP, port 123.For details of Windows firewall port settings, click on Figure 1,2 and 3.Especially those coming with Windows XP or Windows Server 2003, may be (by default) unable to query the time from some NTP servers. standalone server or domain controller), NTP servers may not respond to the type of queries sent by w32time.
This problem has not been observed with the w32time version which has been shipped with Windows 2000, only with later versions.
Using some commands in a command line window, the behavior of w32time can be changed so that w32time sends the correct "client" mode request packets.
The changes are saved permanently in the Windows registry.
For your comfort, this page is excellent to start with.
We've provided a list of the most common causes of NTP time sync troubles.
Check which one applies yours and follow the proposed steps to make time service successful. One reason for NTP synchronisation problems may be a firewall or port filter that is blocking the ports the programs use to communicate (by default UDP port 123).For example in Windows 8, check firewall settings in Control Panel -Advanced settings.So I took a laptop home from work tonight to do some tests and I forgot that I haven’t logged in to that laptop with my domain account for quite some time now so I of course got the message “Domain YOURDOMAIN is not available” and I couldn’t log in.I connect to our network over a VPN connection using Cisco VPN Client but I first have to be logged in to Windows to do this.I want to be able to log in with my domain account directly then log in to the VPN as it is more convenient so here’s what I did to update the local cache for my domain profile: If you’re already able to log in with the cached password, but your current domain password is different from the cached password, while connected to the VPN you can just press CTRL+ALT+DEL, choose the option “Lock Computer”, and then unlock it but this time using your current domain password and that should update the cached password. You have landed here most probably while searching for solution to your NTP synchronization problem, right?