Excessive Network Retransmissions While Running CSNW (196051)

The information in this article applies to:

Microsoft Windows NT Workstation 4.0
Microsoft Windows NT Server 4.0

This article was previously published under Q196051

IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows Registry

SYMPTOMS

Client Services for NetWare (CSNW) may retransmit an NCP packet in 110 ms. The retransmission of 110 ms will occur in a network with a tick count of 2 being announced.

CAUSE

Windows NT uses the TickCount in the NetWare routing packet as a round trip time. In reality, TickCount is the number of ticks it takes a packet to reach the remote destination. One tick equals one-sixteenth of a second. The tick out is used by Windows NT to calculate when to retransmit a packet because it did not receive a response.

RESOLUTION

To resolve this problem, obtain the latest service pack for Windows NT 4.0 or the individual software update. For information on obtaining the latest service pack, please go to:

http://www.microsoft.com/windows/servicepacks/ -or-
152734 how to obtain the latest windows nt 4.0 service pack

For information on obtaining the individual software update, contact Microsoft Product Support Services. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:

http://support.microsoft.com/directory/overview.asp

STATUS

Microsoft has confirmed this to be a problem in Windows NT version 4.0. This problem was first corrected in Windows NT version 4.0 Service Pack 5.

MORE INFORMATION

A tunable parameter has been added to allow the user to increase the tick count on a CSNW client. This parameter will add a user specified number of ticks to the tick count on a client. This user specified value will be added to all tick counts on a system. This will increase the amount of time it takes for Windows NT to retransmit a packet.

WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

Start Registry Editor and go to the following subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services \NwRdr\Paramete
Choose Add Key from the Edit menu and use the following information:
Value Name: TickCountModifier Data Type: REG_DWORD Value: 1 to 255 Value that the tickcounts should be increased

Modification Type:	Minor	Last Reviewed:	9/23/2005
Keywords:	kbHotfixServer kbQFE kbbug kbfix kbQFE KB196051