Hi Shawn, thanks for your help. I pointed WAB 2.1 to Portal but for some reason the browser will not open the WAB interface, the browser just appears blank. I thought this may be down to an issue that Portal would not read the latest version of WAB as it is a couple of versions behind ArcGIS Online.
I then downloaded a fresh version of WAB 1.3 and pointed it towards Portal but the same thing is happening. Any ideas why WAB Dev Ed is not opneing when I point it to Portal?
Finbar