Microsoft small business knowledge base

Article ID: 306441 - Last Review: August 11, 2006 - Revision: 4.1

This article was previously published under Q306441


When you use ActiveX Data Objects (ADO) and ODBC to try to connect to a Microsoft Access database, you may receive the following error message:
Microsoft OLE DB Provider for ODBC Drivers error '80004005'
[Microsoft][ODBC Microsoft Access 97 Driver] Couldn't lock file.


This error message occurs because you do not have the correct permissions to create the lock file (.ldb) for a Microsoft Access database. By default, a lock file is created in the same folder as the Microsoft Access .mdb file.


To resolve this problem, follow these steps:
  1. Grant the user who is accessing the database (usually the IUSR_<computername> account) full control to the share or folder.
  2. Sometimes permissions are restricted on the share because the file is intended to be read-only. You may want to try to change the connection mode, which the following code demonstrates:
       Set Conn = Server.CreateObject("ADODB.Connection")
       Conn.Mode = adModeShareDenyWrite    '8
       '---- ConnectModeEnum Values ----
       'Const adModeUnknown = 0
       'Const adModeRead = 1
       'Const adModeWrite = 2
       'Const adModeReadWrite = 3
       'Const adModeShareDenyRead = 4
       'Const adModeShareDenyWrite = 8
       'Const adModeShareExclusive = &Hc
       'Const adModeShareDenyNone = &H10


This behavior is by design.


For additional information, click the article numbers below to view the articles in the Microsoft Knowledge Base:
174943  ( ) PRB: 80004005 "Couldn't Use '(unknown)'; File Already in Use"

  • Microsoft Active Server Pages 4.0
  • Microsoft Data Access Components 1.5
  • Microsoft Data Access Components 2.0
  • Microsoft Data Access Components 2.1
  • Microsoft Data Access Components 2.1 Service Pack 1
  • Microsoft Data Access Components 2.1 Service Pack 2
  • Microsoft Data Access Components 2.5
  • Microsoft Data Access Components 2.5 Service Pack 1
  • Microsoft Data Access Components 2.5 Service Pack 2
  • Microsoft Data Access Components 2.6
kbprb KB306441
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