Microsoft.Jet.OLEDB.4.0 provider is not registered on the local machine

calendar Jun 16, 2017 · 1 min read · microsoft IIS asp.net windows  ·
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I’ve come across this error a couple of times in the past few weeks when migrating old ASP.NET websites to new web servers so I’m popping it into the blog as an aide-memoire for myself and in case it’s useful for others.

The error message below (Server Error in … Application, The Microsoft.Jet.OLEDB.4.0 provider is not registered on the local machine) pops up when trying to open a page which uses the database (in this case a Microsoft Access DB).

The fix is to enable 32-bit applications for the relevant Application Pool using Internet Information Services Manager.  The Jet drivers are not 64-bit, and by default IIS8 (Server 2012R2) has 32-bit apps disabled.

  1. Open IIS Manager
  2. Navigate to the Application Pools Node underneath the web server.
  3. Select the App Pool in question. If in doubt look at the “Applications” column, if only one has any applications in it then that’s the one you want :)
  4. On the Actions menu on the right-hand side click on “Advanced Settings”
  5. In the “Advanced Settings” dialog set the value of “Enable 32-Bit Applications” to True and click OK.