i'm trying to configure ArcGIS for portal with ArcGIS web adaptor but i've two issues .
The first one is my machine is a workgroup machine , and when i try to configure the Web Adaptor, it requires to specify the URL and an administrator account for my Portal, but always i get an error that Portal configuration requires fully qualified domain name in the Portal URL like the image below ..

Second one is i've created the initial administrator account for ArcGIS portal but when i try to sign in it always redirect me to same page , and seems that i'm not signed in , like the following image shows ..
any help pleaseeee ???