When deploying ArcGIS GeoEvent Server via the 10.8 CloudFormation templates, 10.8 ArcGIS Enterprise for Amazon Web Services (AWS) Cloud Builder, or an Esri Windows Amazon Machine Image (AMI) through the AWS Management Console, you may not be able to access the following URL:
This error is returned when attempting to open ArcGIS GeoEvent Manager, and varies by web browser, but in all cases, the GeoEvent Manager does not load.
ArcGIS GeoEvent Server has a corrupted com.esri.ges.gateway.cfg file due to a hostname change.
This is associated with a known defect, BUG-000129045 .
This bug affects Windows 10.8 AWS cloud deployments. If you are still encountering this problem after following these steps, please contact Esri Technical Support to resolve this issue.