I am unable to enable Living Atlas Subscriber content in ArcGIS Portal ( portal 10.6.1 single box installation). When I try to enable the content at Portal-->Organization --> ArcGIS Online-->Subscriber
getting the error that "The credentials you have provided are not valid or cannot be used with ArcGIS Online Living Atlas content configuration you have specified" . When I verify the developer tools response, found that i am unable to access https://XXX.domain.com/portal/portaladmin/system/content/livingatlas/validate URL and getting "UNABLE_TO_VALIDATE_ONLINE_ORG_USER , java.net.ConnectException: Connection timed out: connect" error.
I am able to access ArcGIS online with the same credentials and able to access subscriber content on ArcGIS Online.