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87 lines
3.4 KiB
87 lines
3.4 KiB
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Date/Time Control Panel
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==============================
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Internet Time Tab
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DESCRIPTION:
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===============
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The internet time section of the Date/Time control panel is made up of several parts:
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timedate.cpl:
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The CPL will allow users to change settings which are stored in the registry. The W32Time service is then sent notifications that settings changed.
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The settings are per-machine so only admins can modify this UI. d
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W32Time.dll: (NT Service)
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The service will then sync at the appropriate time to the appropriate place (DC Time Server vs. internet NTP server).
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time.windows.com: (WindowsUpdate service)
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Our team
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BEHAVIOR:
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===============
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Specs:
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General: http://neptune/arch/gen/AutoSetTimeDate.htm
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Server Deployment: http://www.faqs.org/rfcs/rfc1769.html
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NTP: http://www.faqs.org/rfcs/rfc1769.html
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// This key determins how often we sync from the internet NTP server. Not applicable to DC time servers.
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HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\TimeProviders\NtpServer, "SpecialPollInterval", REG_DWORD = 604800 (1 once per day)
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// This key determins if we try DC time server, internet time servers, or both. AllSync is both.
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HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\Parameters, "Type", REG_SZ = "AllSync"
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// This key is used by the service to determine the server(s) to get the internet time from:
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HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\TimeProviders\NtpServer, "NtpServer", REG_SZ = "time.windows.com,0x3"
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TOP QUESTIONS:
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===============
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Q: Why is the "Internet Time" hidden sometimes?
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A: This tab will not modify the behavior when time comes from the admin controled DC time server. I hide the tab if:
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1. The machine is joined to a domain, AND
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2. We search the domain and find a domain control that will act as a time server
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Q: Why is the UI grayed out?
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A: You need admin privilages to modify these values.
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Q: Will this work with Personal FireWall or other NAT based Firewalls?
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A: Yes.
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Q: Will this work with other popular firewalls (CERN/web proxies, routers that block addresses).
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A: No, most firewalls will block NTP's UDP packets on port 123. Admins can open these ports if they want, but almost never do.
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Q: Why is there a small pause before the "Internet Time" tab appears.
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A: We need to search the domain for a DC that will provide the time. This takes a few seconds on a large corp net, like Microsoft.
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We need to do this because we may need to keep the tab hidden. Some laptops will be joined to a domain and plug and un-plug from
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the corp net. We need the CPL to display the tab in the right cases, so we need to do a search each time. This won't block
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the UI thread.
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Q: Will this work with other popular firewalls (CERN/web proxies, routers that block addresses).
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A: No, most firewalls will block NTP's UDP packets on port 123. Admins can open these ports if they want, but almost never do.
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Q: How can I force the time to sync now?
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A: In a cmd.exe window, do the following commands:
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1. net stop W32time
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2. net start W32time
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CONTACTS:
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===============
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Time/Date CPL: GPease (Dev), JoelGros (PM)
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Internet Time: BryanSt (Dev), JoelGros (PM), SKean (Test)
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W32Time Service: DuncanB (Dev), AdamBarg (Test), MattT (Dev Lead)
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Personal Firewall: Denmor (PM Dennis Morgan), EJohnson (Test), JonBurs (DEV)
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