www.BlackViper.com: Windows 7 Services 411 - DNS Client

DNS Client

Default Description:

The DNS Client service (dnscache) caches Domain Name System (DNS) names and registers the full computer name for this computer. If the service is stopped, DNS names will continue to be resolved. However, the results of DNS name queries will not be cached and the computer's name will not be registered. If the service is disabled, any services that explicitly depend on it will fail to start.

Additional Information:

If you attempt to "Diagnose" your network connection and a dialog box complains that the "DNS resolver failed to flush the cache," this service is the reason.

Only in extreme situations should you disable this service as caching DNS lookups reduces network traffic and makes internet surfing performance faster.

Additional Reading:

• DNS: http://en.wikipedia.org/wiki/Domain_Name_System
• Cache: http://en.wikipedia.org/wiki/Cache

Discussion Topic Link:

Windows 7 Services Forum

Defaults Startup Type:

Windows 7 Starter: Automatic (Started)
Windows 7 Home Basic: Automatic (Started)
Windows 7 Home Premium: Automatic (Started)
Windows 7 Professional: Automatic (Started)
Windows 7 Ultimate: Automatic (Started)
Windows 7 Enterprise: Automatic (Started)

Other Settings:

Safe Setting: Automatic

Service Names:

Service Name (registry): Dnscache

Display Name: DNS Client

Default Path and Command Line Options:

C:\Windows\system32\svchost.exe -k NetworkService

Log On As:

Account: Network Service

Dependencies:

What service DNS Client needs to function properly:

• NetIO Legacy TDI Support Driver (S, HB, HP, P, U, E)
  • TCP/IP Protocol Driver (S, HB, HP, P, U, E)
• Network Store Interface Service (S, HB, HP, P, U, E)
  • NSI proxy service driver (S, HB, HP, P, U, E)

What other service require DNS Client to function properly:

• None (S, HB, HP, P, U, E)

Registry Settings (.reg):

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\Dnscache]
"DisplayName"="@%SystemRoot%\\System32\\dnsapi.dll,-101"
"Group"="TDI"
"ImagePath"=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,\
74,00,25,00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,73,\
00,76,00,63,00,68,00,6f,00,73,00,74,00,2e,00,65,00,78,00,65,00,20,00,2d,00,\
6b,00,20,00,4e,00,65,00,74,00,77,00,6f,00,72,00,6b,00,53,00,65,00,72,00,76,\
00,69,00,63,00,65,00,00,00
"Description"="@%SystemRoot%\\System32\\dnsapi.dll,-102"
"ObjectName"="NT AUTHORITY\\NetworkService"
"ErrorControl"=dword:00000001
"Start"=dword:00000002
"Type"=dword:00000020
"DependOnService"=hex(7):54,00,64,00,78,00,00,00,6e,00,73,00,69,00,00,00,00,00
"ServiceSidType"=dword:00000001
"RequiredPrivileges"=hex(7):53,00,65,00,43,00,68,00,61,00,6e,00,67,00,65,00,4e,\
00,6f,00,74,00,69,00,66,00,79,00,50,00,72,00,69,00,76,00,69,00,6c,00,65,00,\
67,00,65,00,00,00,53,00,65,00,43,00,72,00,65,00,61,00,74,00,65,00,47,00,6c,\
00,6f,00,62,00,61,00,6c,00,50,00,72,00,69,00,76,00,69,00,6c,00,65,00,67,00,\
65,00,00,00,00,00
"FailureActions"=hex:80,51,01,00,00,00,00,00,00,00,00,00,03,00,00,00,14,00,00,\
00,01,00,00,00,c0,d4,01,00,01,00,00,00,e0,93,04,00,00,00,00,00,00,00,00,00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\Dnscache\Parameters]
"ServiceDll"=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,\
00,74,00,25,00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,\
64,00,6e,00,73,00,72,00,73,00,6c,00,76,00,72,00,2e,00,64,00,6c,00,6c,00,00,\
00
"ServiceDllUnloadOnStop"=dword:00000001
"extension"=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,\
74,00,25,00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,64,\
00,6e,00,73,00,65,00,78,00,74,00,2e,00,64,00,6c,00,6c,00,00,00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\Dnscache\Parameters\DnsCache]
"ShutdownOnIdle"=dword:00000001

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\Dnscache\Security]
"Security"=hex:01,00,14,80,f8,00,00,00,04,01,00,00,14,00,00,00,30,00,00,00,02,\
00,1c,00,01,00,00,00,02,80,14,00,ff,01,0f,00,01,01,00,00,00,00,00,01,00,00,\
00,00,02,00,c8,00,08,00,00,00,00,02,18,00,9d,01,02,00,01,02,00,00,00,00,00,\
05,20,00,00,00,21,02,00,00,00,02,18,00,ff,01,0f,00,01,02,00,00,00,00,00,05,\
20,00,00,00,20,02,00,00,00,02,14,00,fd,01,02,00,01,01,00,00,00,00,00,05,12,\
00,00,00,00,00,14,00,8d,01,02,00,01,01,00,00,00,00,00,05,04,00,00,00,00,02,\
14,00,8d,00,02,00,01,01,00,00,00,00,00,05,14,00,00,00,00,02,14,00,8d,00,02,\
00,01,01,00,00,00,00,00,05,13,00,00,00,00,02,18,00,cd,00,02,00,01,02,00,00,\
00,00,00,05,20,00,00,00,2c,02,00,00,00,02,28,00,cd,01,02,00,01,06,00,00,00,\
00,00,05,50,00,00,00,04,c9,44,af,94,d9,d3,e5,2b,e1,b7,1c,17,84,87,13,6e,1a,\
fa,65,01,01,00,00,00,00,00,05,12,00,00,00,01,01,00,00,00,00,00,05,12,00,00,\
00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\Dnscache\TriggerInfo]

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\Dnscache\TriggerInfo\0]
"Type"=dword:00000004
"Action"=dword:00000001
"GUID"=hex:07,9e,56,b7,21,84,e0,4e,ad,10,86,91,5a,fd,ad,09
"Data0"=hex:35,00,33,00,35,00,35,00,00,00,55,00,44,00,50,00,00,00,00,00
"DataType0"=dword:00000002