I have successfully installed Portal for ArcGIS 10.3.1 on an internal server (behind firewall) and have created a map for testing purposes. I can connect to the Portal from my workstation with Web AppBuilder Development Edition. I can create an application. When I go to choose the map from my Portal I can select it just fine, and the thumbnail shows the layers I expect to see. However, when the map is loaded into my application I cannot see any layers, in the map or LayerList widget. So I'm really close, but I have this final hurdle to clear. Has anyone experienced this?
To summarize; I cannot see map services in my Portal map from my workstation WAB.
Thanks for any help you might provide!!