I would like to be able to configure a forward proxy server for ArcGIS for Server like you can in Portal for ArcGIS. Meaning using the AGS admin directory or manager.
The solution for configuring a forward proxy in AGS as described in the below link is not always possible to implement if the AGS service account has no right to login on the server, Which is often the case in restricted environments (policies).
"BAD" - Current way to configure forward proxy in AGS not always possible
"GOOD" - Current way to configure forward proxy in Portal for ArcGIS