Locking Error or Computer Hangs Accessing Network Database Files

 Last reviewed: September 24, 1997
Article ID: Q142803
95 WINDOWS kbnetwork

The information in this article applies to:

  • Microsoft Windows 95

SYMPTOMS

A program that accesses a database on a Windows 95 or Microsoft Windows NT server (or other SMB server) may exhibit the following behavior:

  • The program appears to stop responding (hang).
  • The program returns an error message stating that it was unable to lock a data file.

CAUSE

These problems can occur if two programs are running on the same computer and they both attempt to access the same database. The problems occur because the network redirector routine used for unlocking the file and holding a new pending lock does not work correctly in a multithreaded environment.

RESOLUTION

This issue is resolved by the following updated file for Windows 95: 

   Vredir.vxd version 4.00.954 (10/10/95) and later.
To install this update, follow these steps:

  1. Download the Vrdrupd.exe file from the online service listed below to an empty folder.

  2. In My Computer or Windows Explorer, double-click the Vrdrupd.exe file you downloaded in step 1.

  3. Follow the instructions on the screen.

The following file(s) are available for download from the Microsoft Software Library: 

 ~ vrdrupd.exe (size: 215728 bytes)
For more information about downloading files from the Microsoft Software Library, please see the following article in the Microsoft Knowledge Base: 

   ARTICLE-ID: Q119591
   TITLE     : How to Obtain Microsoft Support Files from Online Services
The following files are installed by Vrdrupd.exe: 

   File name     Version    Date/Time        Size     Destination folder
   ---------------------------------------------------------------------
   Vredir.vxd    4.00.1116  6/2/97  11:16a   156,773  Windows\System
   Vnetsup.vxd   4.00.1112  5/30/97 11:12a    17,595  Windows\System

MORE INFORMATION

For additional information about issues resolved by updates to this component, please see the following articles in the Microsoft Knowledge Base: 

   ARTICLE-ID: Q172594
   TITLE     : Cannot Connect to Server with 15 Characters and Period
               in Name

   ARTICLE-ID: Q165402
   TITLE     : Windows 95 Update to Encrypt Passwords in Memory

   ARTICLE-ID: Q161100
   TITLE     : File May Be Truncated When Copied to a Full Network
               Drive

   ARTICLE-ID: Q157114
   TITLE     : "Access Denied" Attempting to Run File on LM/X Server

   ARTICLE-ID: Q156497
   TITLE     : Duplicate Print Output on PC-LAN Server from Windows 95
               Client

   ARTICLE-ID: Q152186
   TITLE     : Possible Network Data Corruption If Locking Not Used

   ARTICLE-ID: Q148367
   TITLE     : Possible Network File Corruption with Redirector
               Caching

   ARTICLE-ID: Q140558
   TITLE     : Deleting Files on Samba Servers May Delete Local Files
               Instead

   ARTICLE-ID: Q138249
   TITLE     : Updated Vredir.vxd Corrects Errors Running Files on LMX

   ARTICLE-ID: Q160807
   TITLE     : Cannot Connect to Windows NT Server with Many Shares

   ARTICLE-ID: Q150215
   TITLE     : Disabling Automatic Network Shortcut Resolution

   ARTICLE-ID: Q138014
   TITLE     : File May Be Truncated to Zero Bytes When Copied Onto
               Itself

   ARTICLE-ID: Q136834
   TITLE     : Error Copying Read-Only Files to Core SMB Server
The following programs are known to exhibit the behavior described in this article:
  • Microsoft Access Replication Manager
  • Microsoft Visual Basic for Applications and Microsoft Access front-end programs running simultaneously
  • Microsoft Access and Transporter processes running simultaneously on a Windows 95-based client computer

KBCategory: kbnetwork
KBSubcategory: win95 msnets
Additional reference words: 95
Keywords : msnets win95 kberrmsg kbnetwork
Version : 95
Platform : WINDOWS

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Last reviewed: September 24, 1997
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