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Unfederating an ArcGIS GIS Server machine from a Portal for ArcGIS site does not remove the server from the Portal site and returns the following error:
Error: Unable to update the authentication tier of the server prior to unregistering it from the portal. The server has not been changed or unregistered.
The following are possible causes for this issue:
The following are possible solutions for unfederating ArcGIS GIS Server from Portal for ArcGIS:
Note: Ensure that the ArcSOC.exe processes are stopped via the Windows Task Manager. To open the Task Manager, click Start > Run, type task manager and press Enter. The following Microsoft document provides a detailed description on how to use the Windows Task Manager: How to use and troubleshoot issues with Windows Task Manager
Note: To start the Microsoft Services console, Click Start > Run, type services.msc, and press Enter. This Microsoft document provides a detailed description of Services and the Services Microsoft Management Console (MMC) snap-in: Services
Note: This URL provides certain administrative functions not available in the portal website. This document provides a detailed description of the ArcGIS Portal Directory: About the ArcGIS Portal Directory.