ArcGIS Portal runs in a enterprise environment.
Web Adapter is installed on a separate Linux container.
version 10.9
In a corporate environment, there is an additional proprietary WMS service.
If I request
https://myserver.corporateserver/wms?service=wms&request=GetCapabilities
on the browser page, I get the correct response in xml format
When I try to add a service as an Url From Internet WMS(OGC) element, I see in the console that a request is being sent
https://myarcgisportal.corporateserver/arcgis/sharing/proxy?https://corporateserver/wms?
and this request returns error 500..
What needs to be configured to be able to add WMS services to ArcGIS Portal?
