Server side failed requests by Reporting

Hi all,

My situation

- VertiGIS Reporting 5.16.0 on Premise
- A report is being generated from a workflow including Web Map parameters
- The report contains a Map Picture Box element 

Issue

- The map is not shown in the report
- When checking the log I notice network errors (Failed to load resource, see example below)
-  Both the internal portal and the arcgis online Geometry Service cannot be reached.
- The server on which Reporting is installed has internet access. However, through a proxy server which has been configured in the Windows Internet Settings.

Questions

- Does reporting support a portal configured with Web Tier auth through IWA?
- Can Reporting work with a proxy server configuration to access internet resources?
- Any help appreciated to resolve the connection issues.

{
    "$type": "ChromeTraceEvent",
    "id": "5d8a8046b99f4b4ca4a6dd338032e8bf",
    "data": {
        "method": "Log.entryAdded",
        "params": {
            "entry": {
                "source": "network",
                "level": "error",
                "text": "Failed to load resource: net::ERR_NAME_NOT_RESOLVED",
                "timestamp": 1652245611749.36,
                "url": "https://utility.arcgisonline.com/arcgis/rest/services/Geometry/GeometryServer/project?f=json&outSR=28992&inSR=4326&geometries=%7B%22geometryType%22%3A%22esriGeometryEnvelope%22%2C%22geometries%22%3A%5B%7B%22spatialReference%22%3A%7B%22wkid%22%3A4326%7D%2C%22xmin%22%3A5.226199092459899%2C%22ymin%22%3A51.62740896497612%2C%22xmax%22%3A5.3574376149396965%2C%22ymax%22%3A51.809704224851%7D%5D%7D&transformation=108457&transformForward=false",
                "networkRequestId": "1000018304.184"
            }
        }
    },
    "value": "Failed to load resource: net::ERR_NAME_NOT_RESOLVED ( url=https://utility.arcgisonline.com/arcgis/rest/services/Geometry/GeometryServer/project?f=json&outSR=28992&inSR=4326&geometries=%7B%22geometryType%22%3A%22esriGeometryEnvelope%22%2C%22geometries%22%3A%5B%7B%22spatialReference%22%3A%7B%22wkid%22%3A4326%7D%2C%22xmin%22%3A5.226199092459899%2C%22ymin%22%3A51.62740896497612%2C%22xmax%22%3A5.3574376149396965%2C%22ymax%22%3A51.809704224851%7D%5D%7D&transformation=108457&transformForward=false )"
}

{
    "$type": "ChromeTraceEvent",
    "id": "93e616177dc54d11bca8d4b8b3c5ea6f",
    "data": {
        "method": "Log.entryAdded",
        "params": {
            "entry": {
                "source": "network",
                "level": "error",
                "text": "Failed to load resource: the server responded with a status of 401 (Unauthorized)",
                "timestamp": 1652245611631.95,
                "url": "https://internalportaldomain.com/portal/sharing/rest/content/items/79af858920584c4886bccb0f9d5fda45/data?f=json",
                "networkRequestId": "1000007412.161"
            }
        }
    },
    "value": "Failed to load resource: the server responded with a status of 401 (Unauthorized) ( url=https://internalportaldomain.com/portal/sharing/rest/content/items/79af858920584c4886bccb0f9d5fda45/data?f=json )"
}