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DOCUMENT:Q110136 18-JAN-1994 [W_NT]
TITLE :Default Settings and Behavior or NbtKeepAlive and TcpKeepCnt
PRODUCT :Windows NT
PROD/VER:3.10
OPER/SYS:WINDOWS
KEYWORDS:
--------------------------------------------------------------------------
The information in this article applies to:
- Microsoft Windows NT Resource Kit for Windows NT and Windows NT Advanced
Server version 3.1
--------------------------------------------------------------------------
SUMMARY
=======
The Windows NT Resource Kit Volume 1 incorrectly documents the default
settings and behavior for NbtKeepAlive and TcpKeepCnt parameters.
MORE INFORMATION
================
According to the Windows NT Resource Kit Volume 1, the following are
default values for keepalive parameters:
NbtKeepAlive = 0 (disabled)
TcpKeepCnt = 120 seconds
However, the actual defaults are the following:
NbtKeepAlive = 60 seconds
TcpKeepCnt = 120 seconds
Any frame sent by NBT (including a NetBIOS keep-alive) is considered to be
data by TCP. Because the NbtKeepAlive parameter is set lower than
TcpKeepCnt, on an idle NetBIOS session there will be one NBT keep-alive
sent per minute, and no TCP keep-alives sent. On an idle non-NetBIOS TCP
session, such as that used by a Windows Sockets program, TCP keep-alives
will be sent, with their frequency controlled by the TcpKeepCnt parameter.
As documented in the Windows Resource Kit, these parameters can be modified
to produce different behavior. To change these parameters, use the
following procedure:
WARNING: Using the Registry Editor incorrectly can cause serious, system-
wide problems that may require you to reinstall Windows NT to correct
them. Microsoft cannot guarantee that any problems resulting from the
use of Registry Editor can be solved. Use this tool at your own risk.
1. Open the Registry Editor (REGEDT32.EXE).
2. For NbtKeepAlive, use the following path:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Nbt\Parameters
3. Add a value for the NbtKeepAlive parameter as a REG_DWORD with the
desired value in seconds. "0" disables NBT keepalives.
4. For TcpKeepCnt use the following path:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
5. Add a value for the TcpKeepCnt parameter as a REG_DWORD with the desired
value in seconds. "0" disables TCP keepalives.
For example, if you want to send one TCP keep-alive every five minutes, and
no NetBIOS keep-alives, use the following values:
NbtKeepAlive = 0
TcpKeepCnt = 300
REFERENCES
==========
Windows NT Resource Kit, Volume 1
Additional reference words: 3.10 docerr
KBCategory:
KBSubCategory: ntrk
=============================================================================
THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS
PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS
ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO
EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR
ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL,
CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF
MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION
OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES
SO THE FOREGOING LIMITATION MAY NOT APPLY.
Copyright Microsoft Corporation 1994.