ArcGIS GeoAnalytics Server is designed to perform distributed analysis on largevolumes of spatial and temporal data. To efficiently process large datasets, it is recommended that each machine in the GeoAnalytics Server site has at least 16 GB of RAM and 4 CPU cores. However, for optimal performance, especially when handling very large datasets, increasing the available RAM can significantly improve processing times.
In this scenario, the machine already has 16 GB of RAM and 4 cores. Adding more RAM would allow the GeoAnalytics Server to allocate more memory per job, enhancing its ability to process large datasets efficiently. Therefore, the recommended action is to add 16 GB of RAM to the GeoAnalytics Server machine.
Reference Source:ArcGIS Enterprise documentation on GeoAnalytics Server system requirements and performance optimization.

TheGIS Professionaluser type includes access toArcGIS Pro, which is required for creating print layouts, charts, animations, and conducting advanced analysis. It also includes capabilities such as creating groups, editing features, and creating web apps within the ArcGIS Enterprise portal-without needing additional add- on licenses.
TheCreatoruser type supports most web GIS tasks butdoes not include ArcGIS Prounless an add-on license is assigned. TheEditoruser type is the most limited and is intended for editing existing content only, not for creating or managing groups or web applications.
Reference Source:ArcGIS Enterprise documentation - User types, capabilities, and included applications

When using aWeb Adaptorto accessArcGIS Server Manager,administrative access must be explicitly enabled during Web Adaptor configuration. If this setting is not enabled, even valid administrator accounts (including Windows accounts with elevated privileges) will be unable to access ArcGIS Server Manager via the Web Adaptor.
This is a common configuration oversight. The federation, IWA setup, and domain certificate are not the causes here. A domain certificate is valid within trusted enterprise networks, and Windows accounts can access services through IWA once configured correctly.
Reference Source:ArcGIS Enterprise documentation - Enabling administrative access for Web Adaptor

This issue is consistent withdesktop heap exhaustion, especially when a high number ofArcSOC processes (e.g., 390)are running on Windows. Desktop heap is a limited memory resource used for GUI and system object management. When it runs out, services can fail to start and produce XML-related errors.
Increasing thenon-interactive desktop heap sizein the Windows registry resolves this.
From Esri documentation:
"If the Windows desktop heap size is too low, ArcGIS Server may be unable to create new processes (ArcSOC), causing service failures and related internal server errors."
* OptionBis a generic fix and won't address the specific heap exhaustion issue.
* OptionCdoesn't help if the root issue is OS-level heap size limits.
Reference:ArcGIS Enterprise -ArcSOC process limits and Windows desktop heap size

For environments without internet access, the organization can use the patchnotification.bat utility to check for available patches and updates. This utility can be run from the command line and provides information about the current patch status of the ArcGIS Enterprise components. Administrators can then manually download the necessary patches from another machine with internet access and transfer them to the internal environment for installation.
Reference Source: ArcGIS Enterprise documentation on checking for and installing software patches and updates