Article ID: 148367 - Last Review: November 15, 2006 - Revision: 2.4 Possible Network File Damage with Redirector CachingThis article was previously published under Q148367 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
(http://support.microsoft.com/kb/256986/EN-US/
)
Description of the Microsoft Windows Registry
SYMPTOMS When you use the Microsoft Client for Microsoft Networks, a
file on a Microsoft networking server (such as a Microsoft Windows NT, Windows
95, Microsoft Windows for Workgroups, or Microsoft LAN Manager server) may
become damaged or may contain invalid data if multiple workstations access the
file at the same time. CAUSE The network redirector (Vredir.vxd) caches data locally for
files it accesses on a Microsoft networking server. If the file size does not
change or if the last modified time does not change within a two-second period,
the redirector reads file data from the locally stored cache rather than from
the file on the server. RESOLUTIONWARNING: 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. This issue is resolved by the following updated file for Windows 95: VREDIR.VXD version 4.00.1112 (dated 2/11/97) and later Collapse this image  119591
(http://support.microsoft.com/kb/119591/EN-US/
)
How to Obtain Microsoft Support Files from Online Services
Microsoft scanned this file for viruses. Microsoft used the most
current virus-detection software that was available on the date that the file
was posted. The file is stored on security-enhanced servers that help to
prevent any unauthorized changes to the file.
This update resolves this issue by disabling caching on all
FileOpen calls only if the following binary value is present in the registry: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VxD\VREDIR If this value is not present or is set to 0, this update behaves
the same as Vredir.vxd versions 4.00.955 and earlier. Value Name: DiscardCacheOnOpen Value: 01 00 00 00 This value is not added by default and must be added manually in order to disable caching when opening files. STATUS This issue is resolved in Microsoft Windows 98.
MORE INFORMATION For additional information about issues resolved by updates
to this component, please see the following articles in the Microsoft Knowledge
Base: 172594
(http://support.microsoft.com/kb/172594/EN-US/
)
Cannot Connect to Server with 15 Characters and Period in Name
165402
(http://support.microsoft.com/kb/165402/EN-US/
)
Windows 95 Update to Encrypt Passwords in Memory
161100
(http://support.microsoft.com/kb/161100/EN-US/
)
File May Be Truncated When Copied to a Full Network Drive
157114
(http://support.microsoft.com/kb/157114/EN-US/
)
"Access Denied" Attempting to Run File on LM/X Server
152186
(http://support.microsoft.com/kb/152186/EN-US/
)
Possible Network Data Corruption If Locking Not Used
142803
(http://support.microsoft.com/kb/142803/EN-US/
)
Hang or Locking Error Accessing Database Files Over Network
140558
(http://support.microsoft.com/kb/140558/EN-US/
)
Deleting Files on Samba Servers May Delete Local Files Instead
138249
(http://support.microsoft.com/kb/138249/EN-US/
)
Updated Vredir.vxd Corrects Errors Running Files on LMX
160807
(http://support.microsoft.com/kb/160807/EN-US/
)
Cannot Connect to Windows NT Server with Many Shares
150215
(http://support.microsoft.com/kb/150215/EN-US/
)
Disabling Automatic Network Shortcut Resolution
138014
(http://support.microsoft.com/kb/138014/EN-US/
)
File May Be Truncated to Zero Bytes When Copied Onto Itself
136834
(http://support.microsoft.com/kb/136834/EN-US/
)
Error Copying Read-Only Files to Core SMB Server
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