Juri Strumpflohner
Juri Strumpflohner Juri is a full stack developer and tech lead with a special passion for the web and frontend development. He creates online videos for Egghead.io, writes articles on his blog and for tech magazines, speaks at conferences and holds training workshops.

HowTo: Run IIS 7 on Vista 64bit OS in 32bit mode

1 min read

A couple of days ago, I ran into a nice problem. I had to configure the setup of a new project using an old ASP based application as the entry point from which then the new ASP.net application will be started. After a couple of strange error messages I realized that my web application running on the local IIS wasn't able to locate the 32bit driver since I'm having a 64bit Vista installation on my machine. Consequently also the IIS application pool was running in 64bit mode.

After a quick exchange with one of our technicians, he sent me the solution on how to run the IIS in 32bit mode. Here just as a note to myself (and any other potentially interested) on how to downgrade the 64bit IIS to 32bit:
  1. Open IIS
  2. Click Application Pools
  3. Right click DefaultAppPool. Choose "Advanced Settings..."
  4. A properties window will open, having on the upper "General" section a field named "Enable 32-Bit Applications". Set that to true.
  5. Restart your web application and it should work.
 Note this works just on IIS 7 (as far as I know).
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