Registrations are now open. Join us today!
There is still a lot of work to do on the wiki yet! More information about editing can be found here.
Already have an account?

Microsoft KB Archive/251254

From BetaArchive Wiki
Knowledge Base

PRB: "Disk or Network Error" or "Unspecified Error" Returned when Using Jet

Article ID: 251254

Article Last Modified on 12/5/2003


  • Microsoft Open Database Connectivity Driver for Access 3.5
  • Microsoft Open Database Connectivity Driver for Access 3.6
  • Microsoft Open Database Connectivity Driver for Access 4.0
  • Microsoft OLE DB Provider for Jet 3.51
  • Microsoft OLE DB Provider for Jet 4.0
  • Microsoft Data Access Components 2.0
  • Microsoft Data Access Components 2.1
  • Microsoft Data Access Components 2.5
  • Microsoft Data Access Components 2.6

This article was previously published under Q251254


When trying to connect to an Access .mdb file, an ODBC error is returned stating "Disk or Network Error". The Microsoft OLE DB Provider for the Microsoft Jet database engine may also return an "Unspecified error" (error code = 0x80004005) message.

The problem can occur only when the data source is opened under the Microsoft Internet Information Server (IIS) or a Microsoft Windows NT service but not under a logged-on user account.


Jet creates a temporary file when the engine is started. In doing so, it first checks the TMP environment variable and uses that path to define where the temporary file is created. If it doesn't see a TMP environment variable, it looks for the TEMP environment variable. If TEMP is not defined, it then uses the Windows folder (\WINDOWS or \WINNT).

If TMP/TEMP is defined but points to a nonexistent folder, the error occurs.

Moreover, when opening the Access database through IIS or a Windows NT service, and when IIS or the service is running under the local system account, the TMP or TEMP system environment variable is used. When the Web services or Windows NT service are started using a user account, the TMP/TEMP user profile environment variables is used.


Define a TMP or TEMP environment variable and assign the variable to an existing folder. If you are accessing the Access database from IIS, be certain to check the system environment settings rather than environment variables of the logged-on user. Also ensure that the IUSER anonymous IIS account has access to the temporary folder.

You must restart the computer after changing any environment variables.
Environment variables are set under Windows NT 4.0 by going to the Control Panel and clicking System and then selecting the Environment tab.


210457 ASP 0115 or Inetinfo Application Error Occurs on ASP File Running Database Query

164535 Random Errors When Performing IDC or ASP Queries to an Access Database

Keywords: kbdatabase kbjet kbprb kbmdacnosweep KB251254