Microsoft KB Archive/236901

= NetBIOS Remote Name Cache Time-Out Is 60 Seconds Off =

Article ID: 236901

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Server 4.0 Standard Edition
 * Microsoft Windows NT 4.0 Service Pack 1
 * Microsoft Windows NT 4.0 Service Pack 2
 * Microsoft Windows NT 4.0 Service Pack 3
 * Microsoft Windows NT 4.0 Service Pack 4
 * Microsoft Windows NT 4.0 Service Pack 5
 * Microsoft Windows NT 4.0 Service Pack 6
 * Microsoft Windows NT 4.0 Service Pack 6a

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This article was previously published under Q236901



SYMPTOMS
You may see that the NetBIOS Remote Name Cache caches default entries for 660 seconds, even though the default is 600 seconds.



CAUSE
This issue occurs because Windows NT adds an additional 60 seconds to an entry's cache life.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.



MORE INFORMATION
This issue is fixed in Windows 2000. Additionally, Windows 2000 provides much finer granularity for cache TTLs (time-to-live) as well as per-adapter NetBIOS name caching.

This value determines the time interval that names are cached in the remote name table. The CacheTimeout parameter for the NetBIOS Remote Name Table has a range of values from 60 to 4,294,967,295 seconds with a default of 600 seconds.

Using the NBTSTAT -c command at the command prompt you can display the names in the table. Note that by default recently cached names are listed for 660 seconds. If you change the CacheTimeout value to something other than the default, the displayed value is 60 seconds higher than what you entered.

CacheTimeout Key: Netbt\Parameters Value Type: REG_DWORD - Time in milliseconds Valid Range: 0xEA60 to 0xFFFFFFFF Default: 0x927c0 ( 600000 milliseconds = 10 minutes) 

Keywords: kbnetwork kbprb KB236901

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