ArcGIS 10.2.1 will be the last release that supports Microsoft Windows Server 2003 and Windows Server 2003 R2 for ArcGIS for Server, ArcGIS for Desktop, ArcGIS Engine, ArcGIS Reader, and Runtime SDK ...

Portal for ArcGIS At ArcGIS 10.2, Esri gives people the ability to deploy ArcGIS Online capabilities on-premises for tighter content security and control. Portal for ArcGIS provides a secure front end ...

ArcGIS Server is a complete and integrated server-based geographic information system (GIS). It comes with out-of-the-box, end user applications and services for spatial data management ...

The new release is powered by Esri ArcGIS Enterprise, a significant evolution of the technology formerly known as ArcGIS for Server. ArcGIS Enterprise has been updated to meet the needs of today ...

The ArcGIS Server service seems to be running with no issues. But this inability to reach the admin directory is causing all kinds of follow-on problems.