Hi Trevor,
Sorry for the delay in replying. I was trying to find solutions as well.
1/ We installed ArcGIS Server and a webadaptor on the same machine, then Portal on a second machine. Through the url portal https://machinename:7443/arcgis/ we created the portal account, then we installed a webadaptor:
https://localhost/arcgis/webadaptor.
We federated the server and the portal via https://servername:6443/arcgis/admin. The security config is http/https.
We added the server in the portal account service url is in http and admin url is in https. I was wondering if with a proxy, the webadaptor is necessary or not and could be slowing things down.
2/ If I go to the security config https://AGShostname:6443/arcgis/admin I only see http/https, authentication tier: GIS server +. I do not see any URL.
3/ If I go to the portal admin under federation the servername:6443 is seen as hosted server, but shouldn't it be federated server?
4/ Also in the portal admin if I try to validate, even unfederate the server it turns forever and nothing happens. Same if I try from the portal account. I cannot validate it although the URL is the good one, I cannot add another server (it's telling me federation is disabled) and I cannot delete it.
Here is where I am now.