Importance of "Allow unlisted file name extensions" in IIS regarding the Orchestrator instance.
Issue Description:
Orchestrator requires the "Allow unlisted file name extensions" setting to be engaged due to its dynamic page generation process. This process often results in pages that either lack extensions or have unique extensions that resemble GUIDs (for example, 193031F0-D938-4108-B9CC-4ABD39C25FBC). Consequently, it's imperative to maintain the "Allow unlisted file name extensions" setting in an active or checked state at all times.
Resolution:
To avoid issues, "Allow unlisted file name extensions" must always remain checked in the IIS Request Filtering settings.
Steps to locate this setting in IIS:
- Open IIS Manager and select the UiPath Orchestrator website.
- Double-click Request Filtering under the IIS section.
- Go to the File Name Extensions tab.
- In the Actions panel on the right, click Edit Feature Settings.
- Ensure the option "Allow unlisted file name extensions" is checked.
- Click OK to apply the settings.
Impact of Unchecking:
Unchecking this setting will cause Orchestrator to fail in rendering its pages and communicating with other services. You may encounter errors like 404 (Not Found) or failures in the Orchestrator UI that will prevent normal operations, including job executions and accessing assets or logs.