Bitness Mismatch Between IIS Application Pool And Published Application

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How to solve error message of Bitness mismatch between IIS application pool and published application?

Orchestrator Event Viewer error

Unable to load C:Program Files (x86)UiPathOrchestrator.hostfxr.dll.

This might be caused by a bitness mismatch between IIS application pool and published application.



Resolution

  • Go to Application Pools - Advanced Settings - Enable 32-bit application. If it it set to True, set it to False

Reason

By default, the IIS application pool runs on 64-bit mode. To run certain old versions of applications, you might have enabled the 32-bit mode.

To enable IIS to run applications in the 64-bit mode:

  1. Go to Websites & Domains > Dedicated IIS Application Pool for Website.
  2. Right click on the App Pool and Advanced Settings -->Select the “Enable 32-bit applications” and set it to False

If applications that are known to have memory leaks or become unstable after working for a long time are run, it is recommended to restart them from time to time.

Note: Validate all the sites in Application Pools.