Hello,
As reported in the early adopter program, I am facing an issue when trying to upgrade Portal for ArcGIS 11.5 to 12.1: Portal for ArcGIS service does not start after installation.
I tried to reboot the server after the issue occurred but after reboot, I still can't start the service. It is "Stopped" and after clicking on "Start" it immediatly revert back to "Stopped".
So my workflow is the following:
- Working 11.5 ArcGIS Enterprise environment
- Run the install of Portal for ArcGIS 12.1
- At the end of the setup, click OK
- Portal for ArcGIS service does not start
In the event viewer, the following error is logged:

Attached are the, I believe, relevant logs files:
- ws.log (C:\Program Files\Arcgis\Portal\framework\runtime\tomcat)
- commons-daemon.2026-05-27.log (C:\Program Files\Arcgis\Portal\framework\service\logs)
- service_error.log (C:\Program Files\Arcgis\Portal\framework\service\logs)
- arcgis_install_log.txt (C:\Program Files\Arcgis\Portal\framework\support)
There is nothing interesting in Portal for ArcGIS "official" logs.
Environnement: a single Windows Server 2022 VM with Portal for ArcGIS, ArcGIS for Server, ArcGIS relational datastore and both Portal for ArcGIS and ArcGIS for Server Webadaptors installed
Anybody else facing the same issue ?
Thanks
/cc @SimonSchütte_ct @CedricDespierreCorporon