We have a problem here, We have config the arcgis server and portal for arcgis in a single machine. Where portal for arcgis is config with web adaptar in http 80 port & https 443 and Arcgis server manager is config with web adaptar in http 81 port & https 447. Since when we assigned the domain name we made reverse proxy for the Portal for arcgis in Port 81. Both Portal for arcgis & Server manager works good. But the rest services we published in Server can't be accessed in the Portal for arcgis web map when add via the ArcGIS Server web service.
Throws the following error -
Unable to access the authentication service
#Arcgis server & Portal for arcgis.