The background of my server
I installed the ArcGIS server 10.3.1 (No Web Adaptor installed)
I have Windows 2012 Server x64 with SQL Server 2012 R2.
I'm also using IIS 8 as a web server on the same machine.
I am wondering if I could disable the external access to the link for the ArcGIS Server Manager.
For example, assuming the link is "http://gisserver.domain.com:6080/arcgis/manager/". Could I know if there is a way to disable/block the external users to access to the link?