Problem Statement:

Resolution

Recommended registry settings for W32Time Service:

o On PDC,

• HKLM\System\CurrentControlSet\Services\W32time\Config – AnnounceFlag = 5
• HKLM\System\CurrentControlSet\Services\W32time\Config – MaxPollInterval = 10 (2^10 = 1024s)
• HKLM\System\CurrentControlSet\Services\W32time\Config – MinPollInterval = 6
• HKLM\System\CurrentControlSet\Services\W32time\Parameters – Type = NTP
• HKLM\System\CurrentControlSet\Services\W32time\Parameters – NTPServer = <external time source>,0x9
• HKLM\System\CurrentControlSet\Services\W32time\TimeProvider\NTPClient – SpecialPollInterval = 900s
• HKLM\System\CurrentControlSet\Services\W32time\TimeProvider\NTPClient – Enabled = 1
• HKLM\System\CurrentControlSet\Services\W32time\TimeProvider\NTPServer – Enabled = 1

o On other DCs,

• HKLM\System\CurrentControlSet\Services\W32time\Config – AnnounceFlag = 10 - decimal
• HKLM\System\CurrentControlSet\Services\W32time\Config – MaxPollInterval = 10 (by default, it is set to 15. 10 will guarantee a quicker polling interval)
• HKLM\System\CurrentControlSet\Services\W32time\Config – MinPollInterval = 6 (by default, set to 10)
• HKLM\System\CurrentControlSet\Services\W32time\Parameters – Type = NT5DS
• HKLM\System\CurrentControlSet\Services\W32time\Parameters – NTPServer = time.windows.com,0x9
• HKLM\System\CurrentControlSet\Services\W32time\TimeProvider\NTPClient – Enabled = 1
• HKLM\System\CurrentControlSet\Services\W32time\TimeProvider\NTPServer – Enabled = 1

o On member servers and clients,

• HKLM\System\CurrentControlSet\Services\W32time\Config – AnnounceFlag = 10
• HKLM\System\CurrentControlSet\Services\W32time\Config – MaxPollInterval = 10 (by default, it is set to 15. 10 will guarantee a quicker polling interval)
• HKLM\System\CurrentControlSet\Services\W32time\Config – MinPollInterval = 6 (by default, set to 10)
• HKLM\System\CurrentControlSet\Services\W32time\Parameters – Type = NT5DS
• HKLM\System\CurrentControlSet\Services\W32time\Parameters – NTPServer = time.windows.com,0x9
• HKLM\System\CurrentControlSet\Services\W32time\TimeProvider\NTPClient – Enabled = 1
• HKLM\System\CurrentControlSet\Services\W32time\TimeProvider\NTPServer – Enabled = 0

Note:

– If you make a change to registry it requires restart of W32time service to take effect.

– Use w32tm /query /source – to identify the time source

– Use w32tm /resync /rediscover – to resync and rediscover the time source

– Use w32tm /stripchart /computer:<time_source> /samples:5 /dataonly – to see the offset time with time source.

– If you see VM IC Time Synchronization Provider as time source – disable NTP client at VM level and configure HKLM\System\CurrentControlSet\Services\W32time\TimeProvider\VMICTimeProvider – Enabled = 0

 

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